N-acetylation
Benzyloxycarbonylation(N-Terminal)
Phosphorylation-Serine
Phosphorylation-Threonine
Formylation(N-Terminal)
Cyclization (KD , ED , CC, end to end, etc)
Disulfide bridge-one
Disulfide bridge-two
Disulfide bridge-three
Intermolecular Disulfide bridge
Thioester bond cyclic peptide
Amide cyclic(head to tail, side chain to tail, head to side chain, Asp to Lys, Glu to Lys)
Succinylation
Fatty acid (N-Terminal)
Acryl(N-Terminal)
C-amidation
Biotin(N, C term)
Phosphorylation-Tyrosine
Chenodeoxycholic acid (N-Terminal)
Dansylation
Palmytolic acid (N-Terminal)
Myristic acid (N-Terminal)
Thioglycollic acid (N-Terminal)
D(+)Glucose (N-Terminal)
Methyl ester (C terminal)
Ethylamine (C terminal)