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Schreiner organs in hagfish (a,b from tentacles; c,d from oral cavity) exhibit no nucleotidase activity, with either (a,c) ATP or (b,d) ADP as substrate. Arrowheads indicate the perimeter of the Schreiner organs as determined from the brightfield images. Unlike taste buds, Schreiner organs lie in the upper half of the epithelium with no obvious basal processes extending inward to reach the basal membrane of the epithelium.
