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strepo·gen·in | \ ˌstrep-ə-ˈjen-ən 
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\Medical Definition of strepogenin
: a biologically active principle, characteristic chemical structure, or amino acid content attributed especially formerly to various proteins, peptides, or mixtures of them to account for their ability to stimulate growth of various microorganisms and especially one of the genus Lactobacillus (L. casei)
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