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Histogram showing the effects of estradiol and progesterone treatment on the mean number (±SEM) of TH-immunoreactive cells expressing PR immunoreactivity in the locus coeruleus of ovariectomized αWT, αERKO, βWT and βERKO mice treated with either oil (OVX), EB (OVE) or EB plus progesterone (OVEP). Different letters indicate statistical significance (n = 5–11/group)
