https://pubmed.ncbi.nlm.nih.gov/31520576/?from_term=drd3&from_filter=years.2020-2020&from_pos=4
Here the A trait candidate gene was noted to associate with lower prolactin, a chemical associated with maternal behaviors. Females of NPA A type would be least maternal of all while some increase would be expected in females who also had N trait as that trait may or may not be caused by a receptor that affects prolactin? If the N trait is DRD2 or other D2 type receptors, it could affect dopamine activity and thus prolactin activity as the two neurotransmitters are inversely related.
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