1. Two rat clones have been isolated which are similar to known calcitonin-receptor sequences. One of these does not have the distribution expected of a calcitonin receptor. It is widely distributed, with extremely high levels of expression in the lung, where it is associated with the blood vessels.

2. This rat sequence may represent the receptor for calcitonin-gene-related peptide or islet amyloid polypeptide. Both have binding activity in the lung and are potent vasodilators. The gene represented by this sequence may therefore play an important role in the maintenance of vascular tone.

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