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(A) 31P NMR spectrum of spent medium of Streptomyces sp. XY332. (B) 31P NMR spectrum of spent medium of the same strain when grown on 15NH4SO4. The chemical shift variation is the result of small changes in pH as these compounds have pKa values near 7. (C) DNA fragment of the genome from Streptomyces sp. WM 6372 that contains the pepM gene. For color coding, see Figure S6.
