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Colony pigment production by S. xylosus strains. (A) S. xylosus C2apRB473, ΔnospRB473, ΔnospRBnos, ΔnospRBpdt and ΔnospRBnospdt streaked on Tryptic Soy Agar (TSA) plates containing chloramphenicol for three days. (B) Measurement of pigmentation after methanol extraction at λ460 nm. The relative optical density is normalized to C2a, which was set at 100. Data represent means ± SD from n = 3 independent biological replicates. **p < 0.01.
