Using immunocytochemistry and in situ hybridisation expression of calcitonin, calcitonin gene-related peptide (CGRP) and somatostatin was examined in rat thyroids. The immunocytochemical reactions demonstrated the presence of the proteins under investigation at all stages of rat life. Calcitonin and CGRP produced the most numerous parafollicular cells, while somatostatin was present in a few ce...
