Fig 3.

Standard mineral base (SMB)-glucose plates of parent and mutant N. aromaticivorans strains showing the different colony colors in carotenoid pathway deletion mutants (A) or in crtW-expressing engineered strains (B). Some colony colors appear similar despite accumulating different carotenoids (Fig. 2) due to the known similarity in the absorption spectra of their carotenoids (Fig. S1 to S8).