Larsson L I
Histochemistry. 1977 Oct 22;54(2):173-6. doi: 10.1007/BF00489676.
The vasoactive intestinal polypeptide (VIP) represents a neuronal peptide of wide-spread occurrence. By electron microscopic immunocytochemistry VIP has been localized to the granules of the terminals of p-type neurons. This localizations lends support to the postulate that VIP may be a neurotransmitter.