Figure 4From: Non-peptidergic primary afferents are presynaptic to neurokinin-1 receptor immunoreactive lamina I projection neurons in rat spinal cord Confocal triple-labeling image showing the innervation of lamina I spinoparabrachial (A) multipolar, (B) fusiform and (C) pyramidal neurons by IB4+ varicosities (indicated by arrowhead). IB4 (red); NK-1r (green); spinoparabrachial neurons labeled with CTb (white). Scale bar (A-C) = 20 μm.Back to article page