Other actions in mammals

Oestrogen + progesterone + prolactin + growth hormone + adrenal steroids 

Prolactin appears to play a role in regulating the immune system in mammals, though the significance of this is not yet clear. Receptors for the hormone have been 

Parental behaviour (nest-building, buccal incubation of eggs, maintenance of brood pouch) in some species. 

Larval growth antagonizes effects of thyroxine on metamorphosis. 

Stimulation of crop-sac milk production in pigeons and doves. 

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