N-formyl-L-proline (2S)-1-formylpyrrolidine-2-carboxylic acid 1-formyl-2-pyrrolidinecarboxylic acid 1-formylproline 126.05550384521484375 126.1399993896484375 27.994915008544921875 28.010000228881835938 A protein modification that effectively converts an L-proline residue to N-formyl-L-proline. C 1 H 0 N 0 O 1 C 6 H 8 N 1 O 2 CAUTION - observations of this modification can be attributed to unintended artifactual production, or to spurious peptide MS identification. This modification is probably not a natural post-translational modification [JSG]. MOD:00389 N-formyl-L-proline N-formylated L-proline N-term NFoPro P PSI-MOD Unimod:122 hypothetical N-formylated residue modified L-proline residue alpha-amino acylated residue