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  • Title: Immunohistochemical coexistence of calcitonin gene-related peptide and substance P in the nerve fibers of the internal gills of bullfrog (Rana catesbeiana) larvae.
    Author: Kusakabe T, Kawakami T, Hori H, Bandou Y, Takenaka T.
    Journal: Neurosci Lett; 1993 Aug 06; 158(1):59-62. PubMed ID: 7694202.
    Abstract:
    A double-labelling immunofluorescence study of the internal gills of larval bullfrogs revealed coexistence of calcitonin gene-related peptide (CGRP) and substance P (SP) in the same nerve fibers in the gill tufts. More than about 95% of CGRP fibers showed coexistence of SP, although some fibers contained CGRP without SP. In the branchial muscle, all CGRP fibers demonstrated coexistence of SP. These findings suggest that both CGRP- and SP-containing fibers may use both peptides as neuromodulators of active ion transport and gill movements.
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