Chains and heterogens:
PDB Chain Sequences:
>3os4A (A:) mtqdaspiltslldtdayklhmqqavfhhyrhitvaaefrcrsdellgvyadeirhqvtl mgqlaltsdefiylsslpffqddylhwlrdfrfkpeqvsvavhdgkldiriaglwcevim wevpllaviseivhrrrstqvttdqavqqlrtkleqfnalsadidithfklmdfgtrrrf sreiqhtvvstlkdefpylvgtsnydlartlalapvgtqahewfqahqqisptlansqrv alqvwldeypnqlgialtdcitmdaflrdfdlafanryqglrhdsgdpiewgekaiahye klgidpmkkvlvfsdnldlekalflyrhfyqriklvfgigtrltcdipdvkplniviklv ecndkpvaklsdspgkticqdpafvdqlrkafalplvkkasenlyfq
>3os4A (A:) qdaspiltslldtdayklhmqqavfhhyrhitvaaefrcrsdellgvyadeirhqvtlmg qlaltsdefiylsslpffqddylhwlrdfrfkpeqvsvavhdgkldiriaglwcevimwe vpllaviseivhrrrstqvttdqavqqlrtkleqfnalsadidithfklmdfgtrrrfsr eiqhtvvstlkdefpylvgtsnydlartlalapvgtqahewfqahqqisptlansqrval qvwldeypnqlgialtdcitmdaflrdfdlafanryqglrhdsgdpiewgekaiahyekl gidpmkkvlvfsdnldlekalflyrhfyqriklvfgigtrltcdipdvkplniviklvec ndkpvaklsdspgkticqdpafvdqlrkafalp
>3os4B (B:) mtqdaspiltslldtdayklhmqqavfhhyrhitvaaefrcrsdellgvyadeirhqvtl mgqlaltsdefiylsslpffqddylhwlrdfrfkpeqvsvavhdgkldiriaglwcevim wevpllaviseivhrrrstqvttdqavqqlrtkleqfnalsadidithfklmdfgtrrrf sreiqhtvvstlkdefpylvgtsnydlartlalapvgtqahewfqahqqisptlansqrv alqvwldeypnqlgialtdcitmdaflrdfdlafanryqglrhdsgdpiewgekaiahye klgidpmkkvlvfsdnldlekalflyrhfyqriklvfgigtrltcdipdvkplniviklv ecndkpvaklsdspgkticqdpafvdqlrkafalplvkkasenlyfq
>3os4B (B:) daspiltslldtdayklhmqqavfhhyrhitvaaefrcrsdellgvyadeirhqvtlmgq laltsdefiylsslpffqddylhwlrdfrfkpeqvsvavhdgkldiriaglwcevimwev pllaviseivhrrrstqvttdqavqqlrtkleqfnalsadidithfklmdfgtrrrfsre iqhtvvstlkdefpylvgtsnydlartlalapvgtqahewfqahqqisptlansqrvalq vwldeypnqlgialtdcitmdaflrdfdlafanryqglrhdsgdpiewgekaiahyeklg idpmkkvlvfsdnldlekalflyrhfyqriklvfgigtrltcdipdvkplniviklvecn dkpva