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Correlation between SIT expression and cellular processes. (A) Inverse of the SIT1 level (derived from the results obtained with 200 μM Si, shown in Fig. 4A) versus incorporation of a fluorescent silica tracer, rhodamine 123, as described previously (8), in the cell walls of T. pseudonana; (B) correlation between 1/SIT1 level and Si incorporation; (C) SIT2 expression level relative to percentage of cells in S phase (8).
