FIGURE 3.

Spectral phenotype of the mpeU mutant. (A,B) Color phenotypes of control cell (left), mpeU mutant cells with empty vector (middle), and mpeU mutant cells expressing mpeU (right), in green light (A) and blue light (B). The contrast was adjusted on some of the culture pictures in order to better view coloration of the cells. (C,D) Whole cell absorbance spectra for the mpeU mutant (green or blue lines) and control cells (black lines), in green light (C) and blue light (D). (E,F) Whole cell absorbance spectra of mpeU mutant cells with empty vector (green or blue lines), mpeU mutant with vector expressing mpeU (gray lines), and control cells (black lines), in green light (E) and blue light (F). All spectra shown are an average of three independent replicates.