Chains and heterogens:
PDB Chain Sequences:
>1ubnA (A:) aqsvpygvsqikapalhsqgytgsnvkvavidsgidsshpdlkvaggasmvpsetnpfqd nnshgthvagtvaalnnsigvlgvapsaslyavkvlgadgsgqyswiingiewaiannmd vinmslggpsgsaalkaavdkavasgvvvvaaagnegtsgssstvgypgkypsviavgav dssnqrasfssvgpeldvmapgvsiqstlpgnkygayngtcmasphvagaaalilskhpn wtntqvrsslentttklgdsfyygkglinvqaaaq