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Whole-mount in situ hybridization of aphid embryos targeting Rickettsia (red) and Buchnera (green). (A) Mycetomes of an aphid embryo in which secondary mycetocytes and sheath cells harboring Rickettsia are seen in addition to a number of primary mycetocytes harboring Buchnera. (B to D) Magnified images of mycetome. Arrows, secondary mycetocytes; arrowheads, sheath cells; bars, 50 μm.
