. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of epithelial cell differentiation.\" [GOC:mah]" . . "negative regulation of epithelial cell differentiation" . "down regulation of epithelial cell differentiation" . "down-regulation of epithelial cell differentiation" . "downregulation of epithelial cell differentiation" . . . "inhibition of epithelial cell differentiation" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .