In the anterior lobe, PC1/3 is the primary convertase involved in the generation of 16k N-POMC, ACTH and β-LPH. A more comprehensive processing pattern is seen in the intermediate lobe and hypothalamus yielding α-MSH and β-endorphin. APB, aminopeptidase B-like; AACE, acidic ACTH converting enzyme; CPE, carboxypeptidase E; NAT, N-acetyl transferase; PAM, peptidylglycine α-amidating monooxygenase; -END, -endorphin; JP, joining peptide; -MSH, -melanocyte stimulating hormone; PC, prohormone convertase; Ac, acetyl; K, Lysine; R, Arginine.*β-MSH in humans may not occur naturally (Scott and Lowry 1974).