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CGRP labelling of TrkA-positive nerve fibres after CCI. The proportion of Tropomyosin-related kinase A (TrkA) positive fibres that were double-labelled for Calcitonin gene-related peptide (CGRP) increased significantly on the operated side of CCI animals 21 days after mental nerve injury (P < 0.05 Wilcoxon matched pairs test).
