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Identification of bacterial metabolite with phenol red and Nessler’s reagent. (a) Only LB broth, (b) LB broth with phenol red, (c) LB broth with Nessler’s reagent, (d) E. coli K-12 (e) E. coli K-12 with phenol red and (f) E. coli K-12 with Nessler’s reagent.
