I am getting a problem in western blot for ABCB1 in colon tissue in mice. The protein ABCB1 is a drug transporter 170kDa. I am using 8% SDS gel and 0.2um nitrocellulose membrane. The expression for beta actin comes good but ABCB1 (sc-1517 antibody) shows no expression at all. I have modified the lysis buffer with addition of NP40 but still i am getting no results.