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Calcitriol pre-treatment variably regulates colon cancer cellular migration. DLD-1, HCT116, and SW620 colon cancer cells were pre-treated with 1 μM calcitriol (gray bars) or vehicle alone (black bars) for 24 and 48 h, then plated on Boyden migration chamber inserts. Cellular migration was quantified as mean number of cells migrating through the transwell inserts. Columns, average % of cells invading per high-powered field. *P < 0.02.
