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Regulation of root-hair cell and non-hair cell fate determination by transcription factors. The TTG1-GL3/EGL3-WER complex promotes GL2 and CPC expression. The cell expressing GL2 differentiates into a non-hair cell. The CPC protein moves from the non-hair cell to a neighboring cell and competes with WER for binding to GL3/EGL3. The TTG1-GL3/EGL3-CPC complex cannot promote GL2 expression, resulting in the differentiation of a root-hair cell.
