Pellet beads using magnetic separation rack. Wash pellet five times with 500 μl of 1X cell lysis buffer. Keep on ice between washes. Resuspend the pellet with 2040 μl 3X SDS sample buffer, briefly vortex to mix, and briefly microcentrifuge to pellet the sample. Heat the sample to 95100°C for 5 min. Pellet beads using magnetic separation rack.