FOXP1 is differentially active during development of murine vasopressin and oxytocin magnocellular neurons

genomic promoters. Finally, heterozygous FOXP1 knockout mice exhibited a significant reduction in AVP and OXT neuron abundance, with OXT neurons disproportionally affected. We conclude that FOXP1 participates in MCN development, while being differentially active in OXT MCNs relative to AVP MCNs.