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Sensitivity to 0.5% SDS of 72-h-old cyst stages formed in siRNA-treated and untreated cultures. (a) The mature cyst from the control cultures shows no affected morphology after a 5-min exposure to SDS. Scale bar, 10 μm. (b) The immature precyst from the siRNA-treated culture is undergoing lysis after a 3-min treatment with SDS. (c) The empty single-layered cyst wall shelter is a residuum of the SDS-treated precyst.
