We have examined the expression in bovine adrenal medulla of double C2 protein (DOC2), a vesicular protein which associates with intracellular phospholipid and Ca2+ and is implicated in the modulation of regulated exocytosis. Extensive reverse transcription–PCR, Northern blot analyses and in vitro translation reactions have been combined with immunological studies to provide data to suggest that neither DOC2α nor DOC2β is expressed at detectable levels in bovine adrenal chromaffin cells, and that a widely used monoclonal antibody directed against DOC2 also recognizes mitochondrial complex III core protein 2.

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