Human BRCA2 cDNA was cloned into phCMV1 with two repeats of (MBP) at the N-terminus. 293TD cells were transfected and harvested 31 hours post-transfection. Extracts were batch bound to Amylose resin. The protein was eluted with 10 mM maltose, loaded onto HiTrap Q, and step eluted at 450 mM NaCl.