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Drosophila bifurca male reproductive tract. (a) The seminal vesicles (sv) pictured here appear filled to capacity and were dissected from a mature, virgin male whose sperm supply was not diminished (t, testes; p, paragonia; ed, ejaculatory duct; eb, ejaculatory bulb; a, aedeagus). (b) Scanning electron micrograph showing two sperm balls within a dissected seminal vesicle.
