>3u4n_A mol:protein length:21  Insulin A chain
GIVEQCCTSICSLYQLENYCN
>3u4n_B mol:protein length:29  Insulin B chain
FVNQHLCGSHLVEALYLVCGERGFCYTPK
>3u4n_B mol:protein length:29  Insulin B chain
FVNQHLCGSHLVEALYLVCGERGFCYTPK