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The two sexes of the nematode C. elegans. Top: An adult hermaphrodite has a two-armed gonad that exhibits mirror image symmetry around the single vulval opening. The location of each spermatheca is outlined by red squares. Numbers below the gonad indicate the positions of oocytes according to their developmental stages. Bottom: An adult male has a one-armed gonad. Spermatids accumulate in the single vas deferens until they are ejaculated during mating with a hermaphrodite.
