Chains and heterogens:
PDB Chain Sequences:
>1fy4A (A:) ivggtsasagdfpfivsisrnggpwcggsllnantvltaahcvsgyaqsgfqiragslsr tsggitsslssvrvhpsysgnnndlailklstsipsggnigyarlaasgsdpvagssatv agwgatseggsstpvnllkvtvpivsratcraqygtsaitnqmfcagvssggkdscqgds ggpivdssntligavswgngcarpnysgvyasvgalrsfidtya