Formation of new blood vessels from pre-existing vasculature. Increased vessel abundance need not imply normal perfusion or effective drug delivery.
The formation and growth of the organ mediating physiological exchange between maternal and embryonic tissues in placental mammals.
The production and maturation of male gametes, including meiosis in the relevant animals. Failure can cause male hybrid sterility without conspicuous changes in adult external form.
A blastula is an early multicellular stage of animal biological development. The intestinal nucleus transfer experiment distinguishes development beyond this stage from the earliest divisions.
A mammalian embryonic stage with an outer trophectoderm, a cavity and an inner cell mass.

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