The sequence of the human insulin pre-protein is as follows:
Signal peptide: MALLWGLLLPLALALWGPGALA
B-chain: H-GIVDK(T)V(C)CCTSICSLYQLENYCN
C-chain: H-LV(E)EQVPK(D)V(N)EQLEN(Y)K(V)DR(D)D(E)ADVN(E)-
A-chain: YELV(R)A(S)L(T)-A-EKGV-
Note: The letters in parentheses represent potential amino acid variations that can occur due to post-translational modifications.