A third study (17) explored the role of the hypothalamic dopaminergic receptors by evaluating the GH response to apomorphine in the follicular and luteal phases of the menstrual cycle, comparing the effects in eight women who had recovered from postpartum bipolar psychotic episodes with those in nine women not at risk for PPD. This evidence concerns the gene GH1 and progressive pseudorheumatoid arthropathy of childhood.