FIGURE 2.

(A,B) Quantification of the effects of a unilateral vestibular neurectomy on the density of [³H]N-α-methylhistamine binding sites in the cat posterior hypothalamus. The [³H]N-α-methylhistamine binding to histamine H₃ receptors is expressed in fmol/mg protein (ordinates) as the mean ± SEM. Data from the tuberomammillary nucleus (TMN) are given as the average value for the right and left structures in the controls (black histograms); they are provided separately for each side [lesioned (thick hatched histograms) versus intact (thin hatched histograms)] for the cats killed 1 (A) or 3 (B) weeks after unilateral vestibular neurectomy. **P < 0.0001.