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This enzyme is highly specific for N-formylmethionyl peptides.
References
Suda H, Yamamoto K, Aoyagi T, Umezawa H (November 1980). "Purification and properties of N-formylmethionine aminopeptidase from rat liver". Biochimica et Biophysica Acta (BBA) - Enzymology. 616 (1): 60–7. doi:10.1016/0005-2744(80)90263-6. PMID7437450.