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pronucleus    
n. 前核,生殖核

前核,生殖核

pronucleus
n 1: the nucleus of the ovum or sperm after fertilization but
before they fuse to form the nucleus of the zygote

Pronucleus \Pro*nu"cle*us\, n.; pl. {Pronuclei} (-[imac]). [NL.
See {Pro-}, and {Nucleus}.] (Biol.)
One of the two bodies or nuclei (called male and female
pronuclei) which unite to form the first segmentation nucleus
of an impregnated ovum.
[1913 Webster]

Note: In the maturing of the ovum preparatory to
impregnation, a part of the germinal vesicle (see
{Polar body}, under {Polar}) becomes converted into a
number of small vesicles, which aggregate themselves
into a single clear nucleus. which travels towards the
center of the egg and is called the female pronucleus.
In impregnation, the spermatozoon which enters the egg
soon loses its tail, while the head forms a nucleus,
called the male pronucleus, which gradually travels
towards the female pronucleus and eventually fuses with
it, forming the first segmentation nucleus.
[1913 Webster]


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