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Umezawa H, et al. Process for the production of new pepstatins having anti-pepsin activity. US Patent 3,869,347 dated Mar 4 1975
. Classification of Streptomyces griseus (Krainsky 1914) Waksman and Henrici 1948 and related species and the transfer of 'Microstreptospora cinerea' to the genus Streptomyces as Streptomyces yanii sp. nov.. Int. J. Syst. Evol. Microbiol. 55: 1605-1610, 2005.