Chains and heterogens:
PDB Chain Sequences:
>3s1fA (A:) laagtpalgddrgrpwpaslaalaldgklrtdsnataaastdfgnitsalpaavlypsst adlvallsaanstpgwpytiafrgrghslmgqafapggvvvnmaslgdaaapprinvsad gryvdaggeqvwidvlraslargvaprswteylyltvggtlsnagisgqafrhgpqisnv lemdvitghgemvtcskqlnadlfdavlgglgqfgvitrariavepapararwvrlvytd faafsadqerltaprpggggasfgpmsyvegsvfvnqslatdlantgfftdadvarival agernattvysieatlnydnataaaaavdqelasvlgtlsyvegfafqrdvayaafldrv hgeevalnklglwrvphpwlnmfvprsriadfdrgvfkgilqgtdivgplivyplnksmw ddgmsaatpsedvfyavsllfssvapndlarlqeqnrrilrfcdlagiqyktylarhtdr sdwvrhfgaakwnrfvemknkydpkrllspgqdifn
>3s1fA (A:) pwpaslaalaldgklrtdsnataaastdfgnitsalpaavlypsstadlvallsaanstp gwpytiafrgrghslmgqafapggvvvnmaslgdaaapprinvsadgryvdaggeqvwid vlraslargvaprswteylyltvggtlsnagisgqafrhgpqisnvlemdvitghgemvt cskqlnadlfdavlgglgqfgvitrariavepapararwvrlvytdfaafsadqerltap rpasfgpmsyvegsvfvnqslatdlantgfftdadvarivalagernattvysieatlny dnataaaaavdqelasvlgtlsyvegfafqrdvayaafldrvhgeevalnklglwrvphp wlnmfvprsriadfdrgvfkgilqgtdivgplivyplnksmwddgmsaatpsedvfyavs llfssvapndlarlqeqnrrilrfcdlagiqyktylarhtdrsdwvrhfgaakwnrfvem knkydpkrllspgqdifn