>4gbi_A: Insulin A chain GIVEQCCTSICSLYQLENYCN >4gbi_B: Insulin B chain FVNQHLCGSHLVEALYLVCGERGFFYTDKT >4gbi_C: Insulin A chain GIVEQCCTSICSLYQLENYCN >4gbi_D: Insulin B chain FVNQHLCGSHLVEALYLVCGERGFFYTDKT