Chains and heterogens:
PDB Chain Sequences:
>1iovA (A:) mtdkiavllggtsaerevslnsgaavlaglreggidaypvdpkevdvtqlksmgfqkvfi alhgrggedgtlqgmlelmglpytgsgvmasalsmdklrskllwqgaglpvapwvaltra efekglsdkqlaeisalglpvivkpsregssvgmskvvaenalqdalrlafqhdeevlie kwlsgpeftvailgeeilpsiriqpsgtfydyeakylsdetqyfcpagleasqeanlqal vlkawttlgckgwgridvmldsdgqfylleantspgmtshslvpmaarqagmsfsqlvvr ilelad