Examlex
Helper T cells secrete ______.
Umbilical
Relating to or affecting the umbilicus or the umbilical cord, the conduit between the developing embryo or fetus and the placenta.
Uterine
Relating to or associated with the uterus.
Germinal Stage
The initial phase of prenatal development that spans from conception to the implantation of the embryo in the uterine wall.
Blastocyst
An early stage in human embryonic development that consists of a sphere of cells surrounding a fluid-filled cavity and the cluster of cells from which the embryo develops.
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