Word: pellucida
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Dates: during 1991-1991
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...latest clue in the mystery of implantation was hit upon by scientists working on a completely different problem: lazy sperm. Some sperm lack the ability to penetrate the egg's outer membrane, or zona pellucida, often as a result of old testicular injuries or early exposure to toxic chemicals. Several methods have been devised to give these sperm a boost, including microinjection (the sperm is inserted directly into the egg by means of a microscopic needle) and partial zona drilling (a tiny hole is made in the egg's protective shell...
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