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epithelium by Payton Hodges
Sheet of tissue that covers or lines the external and internal body surfaces. The epithelium is...
mesoderm by Hunter Hardy
In biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the...
mesoderm by Jesus Goodwin
the middle of the three primary germ layers of the embryo, lying between the ectoderm and entoderm;...
endoderm by Mariana McCoy
In biology, inner layer of tissue formed in the gastrula stage of the developing embryo. At the end...
Nephrotome by Great Soviet Encyclopedia
the primordium of the excretory organs in embryos of chordate animals and man. Each nephrotome is a...