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Embryonic Stage
A period in prenatal development between the second and eighth weeks after fertilization, where significant growth and differentiation of the embryo occur.
Embryonic Stage
A phase of prenatal development that occurs from implantation through the eighth week of pregnancy, characterized by rapid growth and formation of major structures.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, representing the earliest stage of embryonic development in sexually reproducing organisms.
Uterine Wall
The muscular layer of the uterus where the embryo implants and grows during pregnancy.
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