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Fig. 2. Alkaline phosphatase domain in an intact adult D. melanogaster
tubule pair: (A) control tubules subjected to alkaline phosphatase staining
protocol without chromogenic substrate; the junction with the ureter is shown
with an arrow; (B) DAPI-stained; (C) as in B but subjected to alkaline
phosphatase staining protocol in the presence of NBT/BCIP chromogenic
substrate; the junction with the ureter is shown with an arrow; (D) higher
magnification to show predominantly apical localisation of staining. Scale
bars, 100 µm for A-C, 10 µm for D.