Examlex
The majority of men in the United States experience testosterone deficiency in middle adulthood.
Ovum
The female reproductive cell or egg, which, when fertilized by a sperm, can develop into an embryo.
Blastocyst
A stage of early development in mammals that consists of a spherical outer layer of cells, enclosing a fluid-filled cavity and a cluster of cells.
Embryo
An early stage of development for multicellular organisms, in humans it refers to the period from fertilization until the eighth week.
Uterus
A female reproductive organ where a fetus develops during pregnancy.
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