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Dipeptidase activity in Rhynchosciara americana (Diptera: Sciaridae) is found mainly in midgut caeca cells. The caecal dipeptidase activity is partly soluble and partly membrane bound. Differential centrifugation of midgut caeca homogenates, followed by assays of enzyme markers and dipeptidase, suggest that soluble dipeptidase is cytosolic or weakly associated with the cell glycocalyx. Membrane-bound...