Chains and heterogens:
PDB Chain Sequences:
>1f77A (A:) dlhdkseltdlalanaygqynhpfikeniksdeisgekdlifrnqgdsgndlrvkfatad laqkfknknvdiygasfyykcekiseniseclyggttlnseklaqerviganvwvdgiqk etelirtnkknvtlqeldikirkilsdkykiyykdseiskgliefdmktprdysfdiydl kgendyeidkiyednktlksddishidvnlytk
>1f77A (A:) dlhdkseltdlalanaygqynhpfikeniksdeisgekdlifrnqgdsgndlrvkfatad laqkfknknvdiygasfyykcekisniseclyggttlnseklaqerviganvwvdgiqke telirtnkknvtlqeldikirkilsdkykiyykdseiskgliefdmktprdysfdiydlk gendyeidkiyednktlksddishidvnlytk
>1f77B (B:) dlhdkseltdlalanaygqynhpfikeniksdeisgekdlifrnqgdsgndlrvkfatad laqkfknknvdiygasfyykcekiseniseclyggttlnseklaqerviganvwvdgiqk etelirtnkknvtlqeldikirkilsdkykiyykdseiskgliefdmktprdysfdiydl kgendyeidkiyednktlksddishidvnlyt