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P. rubra DSM‐6842 grown in Difco Marine Media 2216 in the absence (a) and presence (b) of cotton scaffold. (c, d): Partial UPLC‐PDA chromatograms showing absorbance at 250–600 nm for organic extracts of P. rubra DSM‐6842 grown in the presence and absence of cotton (c) supernatant and biomass extracts, and (d) planktonic and cotton‐associated biomass extracts. The peak at 13.6 min has an m/z of 324.1 (M+H)+, identifying the compound as prodigiosin
