Localization of β- and γ-endosymbionts in nymphs of mealybugs. Red, signals of the β-endosymbiont; green, signals of the γ-endosymbiont; blue, signals of the host nuclei. (A to D) P. kraunhiae. (E to H) P. comstocki. (A, C, E, and G) First-instar nymphs. (B, D, F, and H) Second-instar nymphs. (A, B, E, and F) Whole insects. (C, D, G, and H) Bacteriomes.