Step 4.1
LeDuc RD, Schwämmle V, Shortreed MR, Cesnik AJ, Solntsev SK, Shaw JB, Martin MJ, Vizcaino JA, Alpi E, Danis P, Kelleher NL, Smith LM, Ge Y, Agar JN, Chamot-Rooke J, Loo JA, Pasa-Tolic L, Tsybin YO. ProForma: A Standard Proteoform Notation.
https://doi.org/10.1021/acs.jproteome.7b00851