Abstract
Ca 2+-sensitive microelectrodes were used to study changes in cytoplasmic free calcium during progesterone-induced meiotic maturation in Xenopus laevis oocytes. In contrast to previous reports, no changes were detected during the maturation process, although a large activation pulse of Ca 2+ was seen when in vitro matured eggs were parthenogenetically activated. The resting level of Ca 2+ in the oocytes was 0.14 μ M ± 0.05.
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