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  1. Article

    Endocrine Control of Sexual Reproduction in Opalina ranarum Parasitic in Rana temporaria

    IT is well known that opalinids parasitizing the recta of Amphibia multiply asexually by binary fission during most of the year. During the breeding season, however, the reproductive pattern changes to a sexua...

    M. EL MOFTY, J. D. SMYTH in Nature (1960)

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