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Ring canal development is defective in su(Hw) mutants.
From stage 4 to 9, ring canals were detected using F-actin staining (A), and the sizes of rings at each stage were quantified using the measurement tool in ImageJ. The measurements of ring outer diameter in each genotype at stage 5 and 8 are shown in histograms (B and C). Scale bars represent 1µm.
