Development of Multicellular Organisms -- Molecular Biology of the Cell -- NCBI Bookshelf

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An external file that holds a picture, illustration, etc., usually as some form of binary object. The name of referred object is ch21f83.jpg.

Figure 21-83

The early stages of mouse development

The zona pellucida is a jelly capsule from which the embryo escapes after a few days, allowing it to implant in the wall of the uterus. (Photographs courtesy of Patricia Calarco.)