Chains and heterogens:
PDB Chain Sequences:
>1rpt_ (-) kelkfvtlvfrhgdrgpietfpndpikesswpqgfgqltkwgmgqhyelgsyirrrygrf lnnsykhdqvyirstdvdrtlmsamtnlaalfppegnsiwnprllwqpipvhtvslsedr llylpfrdcprfqelksetlkseeflkrlqpyksfidtlpslsgfedqdlfeiwsrlydp lycesvhnftlptwatedamtklkelselsllslygihkqkeksrlqggvlvneilknmk latqpqkarklimysahdttvsglqmaldvyngllppyaschimelyqdngghfvemyyr netqnepypltlpgcthscplekfaelldpvipqdwatecmg