>3v19_A: Insulin GLLEQCCHSICSLYQLENYCN >3v19_B: Insulin FVNQHLCGSHLVEALYLVCGERGFFYTPKT >3v19_C: Insulin GLLEQCCHSICSLYQLENYCN >3v19_D: Insulin FVNQHLCGSHLVEALYLVCGERGFFYTPKT