Chains and heterogens:
PDB Chain Sequences:
>1s7sA (A:) gphslryfvtavsrpglgeprymevgyvddtefvrfdsdaenpryeprarwmeqegpeyw eretqkakgneqsfrvdlrtllgyynqskggshtiqvisgcevgsdgrllrgyqqyaydg cdyialnedlktwtaadmaalitkhkweqageaerlraylegtcvewlrrylkngnatll rtdspkahvthhsrpedkvtlrcwalgfypaditltwqlngeeliqdmelvetrpagdgt fqkwasvvvplgkeqyytchvyhqglpepltlrwepppstvsnmatvavlvvlgaaivtg avvafvmkmrrrntggkggdyalapgsqtsdlslpdckvmvhdphsla
>1s7sA (A:) gphslryfvtavsrpglgeprymevgyvddtefvrfdsdaenpryeprarwmeqegpeyw eretqkakgneqsfrvdlrtllgyynqskggshtiqvisgcevgsdgrllrgyqqyaydg cdyialnedlktwtaadmaalitkhkweqageaerlraylegtcvewlrrylkngnatll rtdspkahvthhsrpedkvtlrcwalgfypaditltwqlngeeliqdmelvetrpagdgt fqkwasvvvplgkeqyytchvyhqglpepltlrwep
>1s7sB (B:) iqktpqiqvysrhppengkpnilncyvtqfhpphieiqmlkngkkipkvemsdmsfskdw sfyilahteftptetdtyacrvkhdsmaepktvywdrdm