Chains and heterogens:
PDB Chain Sequences:
>1piiA (A:) mqtvlakivadkaiwvearkqqqplasfqnevqpstrhfydalqgartafileckkasps kgvirddfdpariaaiykhyasaisvltdekyfqgsfnflpivsqiapqpilckdfiidp yqiylaryyqadacllmlsvldddqyrqlaavahslemgvltevsneeeqeraialgakv vginnrdlrdlsidlnrtrelapklghnvtvisesgintyaqvrelshfangfligsalm ahddlhaavrrvllgenkvcgltrgqdakaaydagaiygglifvatsprcvnveqaqevm aaaplqyvgvfrnhdiadvvdkakvlslaavqlhgneeqlyidtlrealpahvaiwkals vgetlparefqhvdkyvldngqggsgqrfdwsllngqslgnvllagglgadncveaaqtg cagldfnsavesqpgikdarllasvfqtlray