Chains and heterogens:
PDB Chain Sequences:
>1b8tA (A:) mpnwgggkkcgvcqkavyfaeevqcegssfhkscflcmvckknldsttvavhgdeiycks cygkkygpkgkgkgmgagtlstdkgeslgikyeegqshrptnpnasrmaqkvggsdgcpr cgqavyaaekvigagkswhkscfrcakcgkslesttladkdgeiyckgcyaknfgpkgfg fgqgagalihsq