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Porcine oocytes cultured in follicular fluid for various periods of up to 48 h were stained with Hoechst-33342 and classified according to maturation before assaying. Histone H1 kinase activity at metaphase I was approximately 10 times that at the germinal vesicle stage. An abrupt reduction in activity was observed in oocytes emitting the first polar body; then the activity increased again to the same level as at metaphase I. This pattern is similar to those reported in non-mammalian species and supports the concepts that histone H1 kinase is ubiquitous in eukaryotes and controls the meiotic cell cycle in mammals.

Fluctuation of histone H1 kinase activity during meiotic maturation in porcine oocytes