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===Human Chorionic Gonadotrophin (hCG)===

===Human Chorionic Gonadotrophin (hCG)===

hCG is a form of glycoprotein that is synthesised within the trophoblast cells of a [[Blastocyst_Embryonic_Development_-_Anatomy_%26_Physiology|blastocyst]]. hCG is particularly important in primate reproduction where it has a similar effect to LH in stimulating the continued production of progesterone and oestrogens. This represents part of the system involved in foetal-maternal communication and pregnancy recognition. Primate blastocysts therefore produce hCG in relatively high concentrations during the first 3 months of pregnancy. In males hCG increases the growth of the foetal testes.

hCG is a form of glycoprotein that is synthesised within the trophoblast cells of a [[Blastocyst_Embryonic_Development_-_Anatomy_%26_Physiology|blastocyst]]. hCG is particularly important in primate reproduction where it has a similar effect to LH in stimulating the continued production of progesterone and oestrogens. This represents part of the system involved in foetal-maternal communication and pregnancy recognition. Primate blastocysts therefore produce hCG in relatively high concentrations during the first 3 months of pregnancy. hCG has also been suggested to play a role in defence of the embryo from the maternal immune system during the initial stages of pregnancy. In males hCG increases the growth of the foetal testes.

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