Chains and heterogens:
PDB Chain Sequences:
>1b3yA (A:) easvsidakfkahgkkylgtigdqytltkntknpaiikadfgqltpensmkwdatepnrg qftfsgsdylvnfaqsngklirghtlvwhsqlpgwvssitdkntlisvlknhittvmtry kgkiyawdvlneifnedgslrnsvfynvigedyvriafetarsvdpnaklyindynldsa gyskvngmvshvkkwlaagipidgigsqthlgagagsavagalnalasagtkeiaiteld iagasstdyvnvvnaclnqakcvgitvwgvadpdswrsssspllfdgnynpkaaynaian al