Anton Petrov on Spectacular Biochemistry of Animal Reproduction

There's a flash of fluorescence called a zinc spark:

See this Nature Chemistry article: Metal ion fluxes controlling amphibian fertilization.

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In a study published in Scientific Reports, Northwestern researchers have discovered that when the human egg is activated by a sperm enzyme, an explosion of zinc sparks erupt. The size of the eruption is directly related to the health of the egg and its ability to develop into a viable embryo. See Radiant Zinc Fireworks Reveal Quality of Human Egg and this:

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