Figure 2From: Changes in the 5-HT2Areceptor system in the pre-mammillary hypothalamus of the ewe are related to regulation of LH pulsatile secretion by an endogenous circannual rhythmFrequency distribution of labelled neurons in frontal brain sections after in situ hybridization with riboprobes against sheep 5HT2 A -receptor, according to the number of silver grains per neuron, in the premammillary hypothalamus of Ile-de-France ewes during the establishment of refractoriness to short days (experiment 1). Closed and open symbols depict ewes with high or low LH pulsatile activity, respectively.Back to article page