Chains and heterogens:
PDB Chain Sequences:
>1fstA (A:) msvnykppaqksiqeiqeldkddeslrkykeallgrvavsadpnvpnvvvtgltlvcssa pgpleldltgdlesfkkqsfvlkegveyrikisfrvnreivsgmkyiqhtyragvaidat dymvgsygpraeeyefltpveeapkgmlargsysiksrftdddktdhlswewnltikkdw kd
>1fstA (A:) nvpnvvvtgltlvcssapgpleldltgdlesfkkqsfvlkegveyrikisfrvnreivsg mkyiqhtyragvaidatdymvgsygpraeeyefltpveeapkgmlargsysiksrftddd ktdhlswewnltikkdwk
>1fstB (B:) msvnykppaqksiqeiqeldkddeslrkykeallgrvavsadpnvpnvvvtgltlvcssa pgpleldltgdlesfkkqsfvlkegveyrikisfrvnreivsgmkyiqhtyragvaidat dymvgsygpraeeyefltpveeapkgmlargsysiksrftdddktdhlswewnltikkdw kd
>1fstB (B:) lgrvavsadpnvpnvvvtgltlvcssapgpleldltgdlesfkkqsfvlkegveyrikis frvnreivsgmkyiqhtyragvaidatdymvgsygpraeeyefltpveeapkgmlargsy siksrftdddktdhlswewnltikkdwk