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A, rostrocaudal distribution of cells silenced by elevation of arterial blood pressure with projections to the spinal cord or the hypothalamus (i.e. types I, II and III only). Filled section, spinally projecting cells; hatched section, hypothalamus-projecting cells; open section, cells projecting to both spinal cord and hypothalamus. B, comparison of the distribution of cell types I-V I at levels II and III.
