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Probestin is an inhibitor of aminopeptidase M; from Streptomyces azureus MH663-2F6.

Probestin is a potent aminopeptidase N (APN) inhibitor produced by Streptomyces cyanogens MH663-2F6[1].

[1] Yoshida S, et al. Probestin, a new inhibitor of aminopeptidase M, produced by Streptomyces azureus MH663-2F6. II. Structure determination of probestin. J Antibiot (Tokyo). 1990 Feb;43(2):149-53. DOI:10.7164/antibiotics.43.149