Studies on a new immunoactive peptide, FK-156. I. Taxonomy of the producing strains.

Abstract
Two strains of actinomycetes produce a new biologically active substance, designated FK-156. Examination of the morphological, cultural and physiological characteristics of the producing strains, No. C-353 and No. 6724, identified them as Streptomyces olivaceogriseus sp. nov. and S. violaceus, respectively.