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Site-directed mutants were made in which the four base pairs most critical for the binding of the transcription factor to the promoter (the canonical binding site' as determined by Genomatix) were mutated (590-YY1, 590-HBP1(1), 590-PAX6, 590-HPB1(2), and 590-Sp1). integrin switch' that occurs in multiple solid tumors consisting of underexpression of integrins7,8, and10 with concurrent overexpression of integrin4. pRb promotes cell adhesion by inducing expression of integrins necessary for cell adhesion to a substrate. We propose that pRb loss in solid tumors exacerbates aggressiveness by debilitating cellular adhesion, which in turn facilitates tumor cell Imipramine Hydrochloride detachment and metastasis. Keywords:pRb, integrin,…