Abstract

ALTHOUGH the rotation and oscillation of the nuclei of cultured spermatocytes have been known for some years1,2, no correlations of this phenomenon with the stages of mitosis or meiosis, or with the biochemical or cytogenetic events during germ-cell development have been made. Using a new technique for the rapid separation of segments of rat seminiferous tubules containing accurately known cellular associations and stages of meiotic prophase3 we have been able to correlate the rotation of living spermatocyte nuclei with synapsis during rat spermatogenesis.

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