Bio-Rad Nonmagnetic Beads and Related Reagents - Manual (Page 21)

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34. Carefully remove and discard the supernatant from the bead pellet.
35. Resuspend the coupled and washed beads in 150 µL of storage
buffer.
36. Determine the bead concentration using a Coulter Z2 counter or a
hemocytometer.
37. Store coupled beads refrigerated at 2–8°C in the dark.