macrophage studs | silver meta-catalog The oocyte arrests at metaphase

The oocyte arrests at metaphase II of meiosis and stays there until a sperm penetrates the zona pellucida and triggers the calcium surge that completes the second division

In human cells the equivalent role during mitosis falls to topoisomerase II

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macrophage studs | silver meta-catalog The oocyte arrests at metaphasemacrophage studs sterling silver Macrophages are the immune system's cleanup crew. They are drawn to pathogens, cellular debris, anything that doesn't belong. They engulf it, clear it, and recruit the rest of the immune system to help. A tiny pendant for a big idea: the cell that keeps everything in balance. The Science of the Macrophage Macrophages are phagocytic cells derived from monocytes that reside in virtually every tissue, including liver