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  • Title: Evidence for periaqueductal cholecystokinin-substance P neurons projecting to the spinal cord.
    Author: Skirboll L, Hökfelt T, Dockray G, Rehfeld J, Brownstein M, Cuello AC.
    Journal: J Neurosci; 1983 Jun; 3(6):1151-7. PubMed ID: 6189981.
    Abstract:
    Using indirect immunofluorescence techniques combined with retrogradely transported fluorescent dyes, cholecystokinin (CCK)-like and substance P immunoreactive cell bodies in the periaqueductal central grey of the rat brain were studied. Data from both adjacent sections and elution-restaining techniques indicated that some of these central grey cells contain both a CCK-like peptide and substance P. Injection of the fluorescent dye, Fast Blue, into the cervical spinal cord indicated that this CCK-substance P cell group is a descending system. These findings provide evidence for two peptides in a single neuron, and the possible functional significance of such an occurrence is discussed.
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