Chains and heterogens:
PDB Chain Sequences:
>19hcA (A:) aaleptdsgapsaivmfpvgekpnpkgaamkpvvfnhlihekkiadcetchhtgdpvscs tchtvegkaegdyitldramhatdiaarakgntptscvschqsetkerrecagchaittp kddeawcatchditpsmtpsemqkgiagtllpgdnealaaetvlaeatvapvspmlapyk vvidaladkyepsdfthrrhltslmesikddklaqafhdkpeilcatchhrsplsltppk cgschtkeidaadpgrpnlmaayhlecmgchkgmavarprdtdcttchkaaa
>19hcB (B:) aaleptdsgapsaivmfpvgekpnpkgaamkpvvfnhlihekkiadcetchhtgdpvscs tchtvegkaegdyitldramhatdiaarakgntptscvschqsetkerrecagchaittp kddeawcatchditpsmtpsemqkgiagtllpgdnealaaetvlaeatvapvspmlapyk vvidaladkyepsdfthrrhltslmesikddklaqafhdkpeilcatchhrsplsltppk cgschtkeidaadpgrpnlmaayhlecmgchkgmavarprdtdcttchkaaa