Figure 1.

Electron micrographs of oocytes and a morula of O. volvulus and L. loa. (A) Oocyte with several intracellular Wolbachia bacteria (arrows) and uterus wall of O. volvulus. (B, C) Oocytes without any bacteria in the ovary and uterus of L. loa. (D) Young morula without endobacteria in the uterus of L. loa. m, morula, o, oocytes; ov, ovary; u, uterus; scale bar = 2 μm.