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Wild-type D2 (A) and transposon mutant D2W2 (B) strains of P. tunicata showing differences in pigmentation. D2W2 was generated by using the mini-Tn10 mutagenesis system. UV-visible light spectra are shown below agar plates of each strain. The pigments are represented by peaks at 575 and 425 nm for the purple and yellow pigments, respectively.
