Chains and heterogens:
PDB Chain Sequences:
>1cr2A (A:) mrerirehlsseesvgllfsgctgindktlgarggevimvtsgsgmgkstfvrqqalqwg tamgkkvglamleesveetaedliglhnrvrlrqsdslkreiiengkfdqwfdelfgndt fhlydsfaeaetdrllaklaymrsglgcdviildhisivvsasgesderkmidnlmtklk gfakstgvvlvvichlknpdkgkaheegrpvsitdlrgsgalrqlsdtiialernqqgdm pnlvlvrilkcrftgdtgiagymeynketgwlepssy
>1cr2A (A:) mrerirehlsseesvgllfsgctgindktlgarggevimvtsgsgmgkstfvrqqalqwg tamgkkvglamleesveetaedliglhnrvrlrqsdslkreiiengkfdqwfdelfgndt fhlydsfeaetdrllaklaymrsglgcdviildhisirkmidnlmtklkgfakstgvvlv vichlksgalrqlsdtiialernnlvlvrilkcrftgdtgiagymeynketgwlepssy