Article: Recent findings in reproduction described by researchers from University of Lodz.

"During spermiogenesis of an alga Chara vulgaris, which in many aspects resembles that of animals, histones are replaced by protamine-type proteins. Our earlier immunocytochemical studies showed that this replacement started during the short stage V of spermiogenesis, when electronograms revealed an extensive system of cisternae and vesicles of endoplasmic reticulum (ER)," investigators in Lodz, Poland report (see also Reproduction).

"The present studies revealed at stage V intensive incorporation of labeled H-3-arginine and H-3-lysine quickly translocating into a nucleus visualized with pulse-chase autoradiography of semithin sections. The immunogold technique ...

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