Lineage for Protein: automated matches

  1. Root: SCOPe 2.03
  2. 1454900Class f: Membrane and cell surface proteins and peptides [56835] (57 folds)
  3. 1457799Fold f.26: Bacterial photosystem II reaction centre, L and M subunits [81484] (1 superfamily)
    five transmembrane helices forming a sheet-like structure
  4. 1457800Superfamily f.26.1: Bacterial photosystem II reaction centre, L and M subunits [81483] (1 family) (S)
    automatically mapped to Pfam PF00124
  5. 1457801Family f.26.1.1: Bacterial photosystem II reaction centre, L and M subunits [81482] (5 proteins)
    L and M are probably related to each other
  6. 1457967Protein automated matches [190224] (5 species)
    not a true protein

Species:

  1. 1457968Blastochloris viridis [TaxId:1079] [187141] (5 PDB entries)
    1. Domains for 1vrn:
      1. 1457975Domain d1vrnl_: 1vrn L: [161868]
        Other proteins in same PDB: d1vrnc_, d1vrnh1, d1vrnh2
        automated match to d1prcl_
        complexed with bcb, bpb, fe2, hem, lda, mq9, ns5, so4, uq7
      2. 1457976Domain d1vrnm_: 1vrn M: [161869]
        Other proteins in same PDB: d1vrnc_, d1vrnh1, d1vrnh2
        automated match to d1dxrm_
        complexed with bcb, bpb, fe2, hem, lda, mq9, ns5, so4, uq7
    2. Domains for 2i5n:
      1. 1457971Domain d2i5nl_: 2i5n L: [137066]
        Other proteins in same PDB: d2i5nc_, d2i5nh1, d2i5nh2
        automated match to d1prcl_
        complexed with bcb, bpb, fe2, hec, hto, lda, mq9, ns5, so4, unl, uq1
      2. 1457972Domain d2i5nm_: 2i5n M: [137067]
        Other proteins in same PDB: d2i5nc_, d2i5nh1, d2i5nh2
        automated match to d1dxrm_
        complexed with bcb, bpb, fe2, hec, hto, lda, mq9, ns5, so4, unl, uq1
    3. Domains for 3g7f:
      1. 1457977Domain d3g7fl_: 3g7f L: [176408]
        Other proteins in same PDB: d3g7fc_, d3g7fh1, d3g7fh2
        automated match to d1prcl_
        complexed with bcb, bpb, fe2, hec, hto, lda, mq9, ns5, so4, uq1; mutant
      2. 1457978Domain d3g7fm_: 3g7f M: [176409]
        Other proteins in same PDB: d3g7fc_, d3g7fh1, d3g7fh2
        automated match to d1dxrm_
        complexed with bcb, bpb, fe2, hec, hto, lda, mq9, ns5, so4, uq1; mutant
    4. Domains for 3t6d:
      1. 1457973Domain d3t6dl_: 3t6d L: [185658]
        Other proteins in same PDB: d3t6dc_
        automated match to d1prcl_
        complexed with bcb, bpb, dga, fe2, gol, hec, hth, hto, lda, mq9, ns5, so4, uq9
      2. 1457974Domain d3t6dm_: 3t6d M: [185659]
        Other proteins in same PDB: d3t6dc_
        automated match to d1dxrm_
        complexed with bcb, bpb, dga, fe2, gol, hec, hth, hto, lda, mq9, ns5, so4, uq9
    5. Domains for 3t6e:
      1. 1457969Domain d3t6el_: 3t6e L: [185660]
        Other proteins in same PDB: d3t6ec_, d3t6eh1, d3t6eh2
        automated match to d1prcl_
        complexed with bcb, bpb, dga, fe2, gol, hec, hto, lda, mq9, ns5, so4, uq9
      2. 1457970Domain d3t6em_: 3t6e M: [185661]
        Other proteins in same PDB: d3t6ec_, d3t6eh1, d3t6eh2
        automated match to d1dxrm_
        complexed with bcb, bpb, dga, fe2, gol, hec, hto, lda, mq9, ns5, so4, uq9
  2. 1457979Rhodobacter sphaeroides [TaxId:1063] [186985] (31 PDB entries)
    1. Domains for 2bnp:
      1. 1458027Domain d2bnpa_: 2bnp A: [128847]
        Other proteins in same PDB: d2bnpc1, d2bnpc2
        automated match to d1aigl_
        complexed with bcl, bph, cl, fe2, mst, po4, u10
      2. 1458028Domain d2bnpb_: 2bnp B: [128848]
        Other proteins in same PDB: d2bnpc1, d2bnpc2
        automated match to d1ystm_
        complexed with bcl, bph, cl, fe2, mst, po4, u10
    2. Domains for 2bns:
      1. 1458015Domain d2bnsa_: 2bns A: [128855]
        Other proteins in same PDB: d2bnsc1, d2bnsc2
        automated match to d1aigl_
        complexed with bcl, bph, cl, fe2, mst, po4, u10
      2. 1458016Domain d2bnsb_: 2bns B: [128856]
        Other proteins in same PDB: d2bnsc1, d2bnsc2
        automated match to d1ystm_
        complexed with bcl, bph, cl, fe2, mst, po4, u10
    3. Domain for 2boz:
    4. Domains for 2gnu:
      1. 1457992Domain d2gnul_: 2gnu L: [135419]
        Other proteins in same PDB: d2gnuh1, d2gnuh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, fe2, lda, u10
      2. 1457993Domain d2gnum_: 2gnu M: [135420]
        Other proteins in same PDB: d2gnuh1, d2gnuh2
        automated match to d1aijm_
        complexed with bcl, bph, cdl, cl, fe2, lda, u10
    5. Domains for 2hg3:
      1. 1458013Domain d2hg3l_: 2hg3 L: [136391]
        Other proteins in same PDB: d2hg3h1, d2hg3h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, k, lda, pc9, po4, u10
      2. 1458014Domain d2hg3m_: 2hg3 M: [136392]
        Other proteins in same PDB: d2hg3h1, d2hg3h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, k, lda, pc9, po4, u10
    6. Domains for 2hg9:
      1. 1457994Domain d2hg9l_: 2hg9 L: [136394]
        Other proteins in same PDB: d2hg9h1, d2hg9h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pc7, pck, po4, u10
      2. 1457995Domain d2hg9m_: 2hg9 M: [136395]
        Other proteins in same PDB: d2hg9h1, d2hg9h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pc7, pck, po4, u10
    7. Domains for 2hh1:
      1. 1458009Domain d2hh1l_: 2hh1 L: [136466]
        Other proteins in same PDB: d2hh1h1, d2hh1h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, k, lda, pc7, pc9, po4, u10
      2. 1458010Domain d2hh1m_: 2hh1 M: [136467]
        Other proteins in same PDB: d2hh1h1, d2hh1h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, k, lda, pc7, pc9, po4, u10
    8. Domains for 2hhk:
      1. 1457996Domain d2hhkl_: 2hhk L: [136499]
        Other proteins in same PDB: d2hhkh1, d2hhkh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pgk, pgt, po4, u10
      2. 1457997Domain d2hhkm_: 2hhk M: [136500]
        Other proteins in same PDB: d2hhkh1, d2hhkh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pgk, pgt, po4, u10
    9. Domains for 2hit:
      1. 1458023Domain d2hitl_: 2hit L: [136531]
        Other proteins in same PDB: d2hith1, d2hith2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pev, pew, po4, u10
      2. 1458024Domain d2hitm_: 2hit M: [136532]
        Other proteins in same PDB: d2hith1, d2hith2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, fe, gol, k, lda, pev, pew, po4, u10
    10. Domains for 2j8c:
      1. 1457980Domain d2j8cl_: 2j8c L: [147909]
        Other proteins in same PDB: d2j8ch1, d2j8ch2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, ggd, gol, hto, lda, pc1, po4, spo, u10
      2. 1457981Domain d2j8cm_: 2j8c M: [147910]
        Other proteins in same PDB: d2j8ch1, d2j8ch2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, ggd, gol, hto, lda, pc1, po4, spo, u10
    11. Domains for 2j8d:
      1. 1457988Domain d2j8dl_: 2j8d L: [147911]
        Other proteins in same PDB: d2j8dh1, d2j8dh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10
      2. 1457989Domain d2j8dm_: 2j8d M: [147912]
        Other proteins in same PDB: d2j8dh1, d2j8dh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10
    12. Domains for 2jiy:
      1. 1457986Domain d2jiyl_: 2jiy L: [148119]
        Other proteins in same PDB: d2jiyh1, d2jiyh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, d12, fe, lda, po4, spn, u10; mutant
      2. 1457987Domain d2jiym_: 2jiy M: [161478]
        Other proteins in same PDB: d2jiyh1, d2jiyh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, d12, fe, lda, po4, spn, u10; mutant
    13. Domains for 2jj0:
      1. 1458031Domain d2jj0l_: 2jj0 L: [148122]
        Other proteins in same PDB: d2jj0h1, d2jj0h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, fe, spn, u10; mutant
      2. 1458032Domain d2jj0m_: 2jj0 M: [161479]
        Other proteins in same PDB: d2jj0h1, d2jj0h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, fe, spn, u10; mutant
    14. Domains for 2uws:
      1. 1458035Domain d2uwsl_: 2uws L: [152221]
        Other proteins in same PDB: d2uwsh1, d2uwsh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, gol, lda, po4, spo, u10, uq2
      2. 1458036Domain d2uwsm_: 2uws M: [152222]
        Other proteins in same PDB: d2uwsh1, d2uwsh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, gol, lda, po4, spo, u10, uq2
    15. Domains for 2uwt:
      1. 1458021Domain d2uwtl_: 2uwt L: [152223]
        Other proteins in same PDB: d2uwth1, d2uwth2
        automated match to d1aigl_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458022Domain d2uwtm_: 2uwt M: [152224]
        Other proteins in same PDB: d2uwth1, d2uwth2
        automated match to d1ystm_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
    16. Domains for 2uwu:
      1. 1457984Domain d2uwul_: 2uwu L: [152225]
        Other proteins in same PDB: d2uwuh1, d2uwuh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1457985Domain d2uwum_: 2uwu M: [152226]
        Other proteins in same PDB: d2uwuh1, d2uwuh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    17. Domains for 2uwv:
      1. 1458005Domain d2uwvl_: 2uwv L: [152227]
        Other proteins in same PDB: d2uwvh1, d2uwvh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458006Domain d2uwvm_: 2uwv M: [152228]
        Other proteins in same PDB: d2uwvh1, d2uwvh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
    18. Domains for 2uww:
      1. 1457990Domain d2uwwl_: 2uww L: [152229]
        Other proteins in same PDB: d2uwwh1, d2uwwh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1457991Domain d2uwwm_: 2uww M: [152230]
        Other proteins in same PDB: d2uwwh1, d2uwwh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    19. Domains for 2ux3:
      1. 1458011Domain d2ux3l_: 2ux3 L: [152252]
        Other proteins in same PDB: d2ux3h1, d2ux3h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458012Domain d2ux3m_: 2ux3 M: [152253]
        Other proteins in same PDB: d2ux3h1, d2ux3h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    20. Domains for 2ux4:
      1. 1458017Domain d2ux4l_: 2ux4 L: [152254]
        Other proteins in same PDB: d2ux4h1, d2ux4h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458018Domain d2ux4m_: 2ux4 M: [152255]
        Other proteins in same PDB: d2ux4h1, d2ux4h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    21. Domains for 2ux5:
      1. 1458001Domain d2ux5l_: 2ux5 L: [152256]
        Other proteins in same PDB: d2ux5h1, d2ux5h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458002Domain d2ux5m_: 2ux5 M: [152257]
        Other proteins in same PDB: d2ux5h1, d2ux5h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    22. Domains for 2uxj:
      1. 1457999Domain d2uxjl_: 2uxj L: [152302]
        Other proteins in same PDB: d2uxjh1, d2uxjh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458000Domain d2uxjm_: 2uxj M: [152303]
        Other proteins in same PDB: d2uxjh1, d2uxjh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    23. Domains for 2uxk:
      1. 1458007Domain d2uxkl_: 2uxk L: [152304]
        Other proteins in same PDB: d2uxkh1, d2uxkh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458008Domain d2uxkm_: 2uxk M: [152305]
        Other proteins in same PDB: d2uxkh1, d2uxkh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, po4, spo, u10, uq2
    24. Domains for 2uxl:
      1. 1458029Domain d2uxll_: 2uxl L: [152306]
        Other proteins in same PDB: d2uxlh1, d2uxlh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, gol, hto, lda, spo, u10, uq2
      2. 1458030Domain d2uxlm_: 2uxl M: [152307]
        Other proteins in same PDB: d2uxlh1, d2uxlh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, gol, hto, lda, spo, u10, uq2
    25. Domains for 2uxm:
      1. 1458025Domain d2uxml_: 2uxm L: [152308]
        Other proteins in same PDB: d2uxmh1, d2uxmh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
      2. 1458026Domain d2uxmm_: 2uxm M: [152309]
        Other proteins in same PDB: d2uxmh1, d2uxmh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, gol, hto, lda, po4, spo, u10, uq2
    26. Domains for 2wx5:
      1. 1458033Domain d2wx5l_: 2wx5 L: [169679]
        Other proteins in same PDB: d2wx5h1, d2wx5h2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, na, spn, u10
      2. 1458034Domain d2wx5m_: 2wx5 M: [169680]
        Other proteins in same PDB: d2wx5h1, d2wx5h2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, fe, gol, hto, lda, na, spn, u10
    27. Domains for 3i4d:
      1. 1457982Domain d3i4dl_: 3i4d L: [178082]
        Other proteins in same PDB: d3i4dh1, d3i4dh2
        automated match to d1aigl_
        complexed with bcl, bph, cdl, cl, dio, fe, gol, ht3, hto, k, lda, po4, spo, u10, uq1
      2. 1457983Domain d3i4dm_: 3i4d M: [178083]
        Other proteins in same PDB: d3i4dh1, d3i4dh2
        automated match to d1ystm_
        complexed with bcl, bph, cdl, cl, dio, fe, gol, ht3, hto, k, lda, po4, spo, u10, uq1
    28. Domains for 3zum:
      1. 1458019Domain d3zuml_: 3zum L: [186593]
        Other proteins in same PDB: d3zumh1, d3zumh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, lda, po4, spn, u10; mutant
      2. 1458020Domain d3zumm_: 3zum M: [186594]
        Other proteins in same PDB: d3zumh1, d3zumh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, lda, po4, spn, u10; mutant
    29. Domains for 3zuw:
      1. 1458003Domain d3zuwl_: 3zuw L: [186595]
        Other proteins in same PDB: d3zuwh1, d3zuwh2
        automated match to d1aigl_
        complexed with bcl, bph, fe, lda, po4, spn, u10; mutant
      2. 1458004Domain d3zuwm_: 3zuw M: [186596]
        Other proteins in same PDB: d3zuwh1, d3zuwh2
        automated match to d1ystm_
        complexed with bcl, bph, fe, lda, po4, spn, u10; mutant
    30. Domain for 4n7k:
    31. Domain for 4n7l:
  3. 1458039Rhodopseudomonas viridis [TaxId:1079] [189054] (2 PDB entries)
    1. Domains for 2wjm:
      1. 1458042Domain d2wjml_: 2wjm L: [169381]
        Other proteins in same PDB: d2wjmc_, d2wjmh1, d2wjmh2
        automated match to d1prcl_
        complexed with bcb, bpb, dga, fe2, hem, mpg, mq7, ns5, po4
      2. 1458043Domain d2wjmm_: 2wjm M: [169382]
        Other proteins in same PDB: d2wjmc_, d2wjmh1, d2wjmh2
        automated match to d1dxrm_
        complexed with bcb, bpb, dga, fe2, hem, mpg, mq7, ns5, po4
    2. Domains for 2wjn:
      1. 1458040Domain d2wjnl_: 2wjn L: [169384]
        Other proteins in same PDB: d2wjnc_, d2wjnh1, d2wjnh2
        automated match to d1prcl_
        complexed with bcb, bpb, fe2, hem, mpg, mq7, ns5
      2. 1458041Domain d2wjnm_: 2wjn M: [169385]
        Other proteins in same PDB: d2wjnc_, d2wjnh1, d2wjnh2
        automated match to d1dxrm_
        complexed with bcb, bpb, fe2, hem, mpg, mq7, ns5
  4. 1458044Thermosynechococcus elongatus [TaxId:32046] [188744] (2 PDB entries)
    1. Domains for 3bz1:
      1. 1458047Domain d3bz1a_: 3bz1 A: [172942]
        Other proteins in same PDB: d3bz1b_, d3bz1c_, d3bz1e_, d3bz1f_, d3bz1h_, d3bz1i_, d3bz1j_, d3bz1k_, d3bz1l_, d3bz1m_, d3bz1o_, d3bz1t_, d3bz1u_, d3bz1v_, d3bz1z_
        automated match to d2axta1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, hem, lhg, lmg, lmt, oec, pho, pl9, sqd
      2. 1458048Domain d3bz1d_: 3bz1 D: [172943]
        Other proteins in same PDB: d3bz1b_, d3bz1c_, d3bz1e_, d3bz1f_, d3bz1h_, d3bz1i_, d3bz1j_, d3bz1k_, d3bz1l_, d3bz1m_, d3bz1o_, d3bz1t_, d3bz1u_, d3bz1v_, d3bz1z_
        automated match to d2axtd1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, hem, lhg, lmg, lmt, oec, pho, pl9, sqd
    2. Domains for 3bz2:
      1. 1458045Domain d3bz2a_: 3bz2 A: [172953]
        Other proteins in same PDB: d3bz2b_, d3bz2c_, d3bz2e_, d3bz2f_, d3bz2h_, d3bz2i_, d3bz2j_, d3bz2k_, d3bz2l_, d3bz2m_, d3bz2o_, d3bz2t_, d3bz2u_, d3bz2v_, d3bz2z_
        automated match to d2axta1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, hem, lhg, lmg, lmt, oec, pho, pl9, sqd
      2. 1458046Domain d3bz2d_: 3bz2 D: [172954]
        Other proteins in same PDB: d3bz2b_, d3bz2c_, d3bz2e_, d3bz2f_, d3bz2h_, d3bz2i_, d3bz2j_, d3bz2k_, d3bz2l_, d3bz2m_, d3bz2o_, d3bz2t_, d3bz2u_, d3bz2v_, d3bz2z_
        automated match to d2axtd1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, hem, lhg, lmg, lmt, oec, pho, pl9, sqd
  5. 1458049Thermosynechococcus vulcanus [TaxId:32053] [189911] (2 PDB entries)
    1. Domains for 3arc:
      1. 1458050Domain d3arca_: 3arc A: [172308]
        Other proteins in same PDB: d3arcb_, d3arcc_, d3arce_, d3arcf_, d3arch_, d3arci_, d3arcj_, d3arck_, d3arcl_, d3arcm_, d3arco_, d3arct_, d3arcu_, d3arcv_, d3arcz_
        automated match to d2axta1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, gol, hem, htg, lhg, lmg, lmt, mg, oex, pho, pl9, sqd, unl
      2. 1458051Domain d3arcd_: 3arc D: [172311]
        Other proteins in same PDB: d3arcb_, d3arcc_, d3arce_, d3arcf_, d3arch_, d3arci_, d3arcj_, d3arck_, d3arcl_, d3arcm_, d3arco_, d3arct_, d3arcu_, d3arcv_, d3arcz_
        automated match to d2axtd1
        complexed with bcr, bct, ca, cl, cla, dgd, fe2, gol, hem, htg, lhg, lmg, lmt, mg, oex, pho, pl9, sqd, unl
    2. Domain for 4il6:

More info for Protein automated matches from f.26.1.1: Bacterial photosystem II reaction centre, L and M subunits

Timeline for Protein automated matches from f.26.1.1: Bacterial photosystem II reaction centre, L and M subunits: