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Pronuclear nucleolus

High power TEM of part of a pronuclear nucleolus in a stage 1b embryo in vitro, 17 hours post-insemination (original magnification x51,710). The nucleolus is dense, compact and homogenous, and composed of fine fibrils. The chromatin is highly dispersed and finely granular.

From: Sathananthan and Trounson, 1985. Reproduced with permission of the publisher, John Wiley & Sons.

Keywords: chromatin, nucleolus, pronuclear nucleolus, stage 1b embryo

Source: The Virtual Human Embryo.