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** Foetal blood osmotic regulator
 
** Foetal blood osmotic regulator
 
** Carrier of fatty acids
 
** Carrier of fatty acids
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* As GnRH surges, LH and Oestradiol surge ~ every 20 days in the female.
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** Surge frequency varies between species, dependent on the length of their oestrous cycles.
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* Between surges, there are low amplitude LH pulses.
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