Ultrastructural analysis of the midgut of Drosophila auraria larvae - Distribution of alkaline phosphatase, acid phosphatase, leucine aminopeptidase, and glycogen.

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Abstract
The posterior midgut of Drosophila auraria larvae, and more specifically its anterior half, must be considered an important region for the digestion and the uptake of nutrients. The cells, and the region of the central lumen they define, are unique in that they give positive reaction for alkaline phosphatase; they also give the strongest histochemical reaction for leucine aminopeptidase. There are histochemical indications that the middle midgut, and especially its posterior region, can be a differentiated area of sugar storage.