According to a study published in Scientific Reports, an explosion of zinc fireworks occurs when a human egg is activated by a sperm enzyme. The intensity of the sparks, scientists say, indicates the egg's potential to develop into a healthy embryo.
- During Conception, Human Eggs Emit Sparks
там ссылки на Nature... no kidding, The zinc spark is an inorganic signature of human egg activation:
Egg activation refers to events required for transition of a gamete into an embryo, including establishment of the polyspermy block, completion of meiosis, entry into mitosis, selective recruitment and degradation of maternal mRNA, and pronuclear development.
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