1. Obtain human blood from a healthy donor. Allow the blood to cool to room temperature (~30 min) before proceeding to the next step.
2. Gently pipette 3 mL of room temperature Polymorph density gradient media into an 8 mL round-bottom polystyrene tube. Gently add 3 mL of
whole blood on top of the Polymorph media. It is important to avoid mixing of the two reagents.
3. Centrifuge the tubes at 500 x g for 45 minutes at room temperature.
4. Following the centrifugation, the peripheral blood mononuclear cells (PBMC) have now separated from other blood components into the top
cell layer. The PBMC layer appears, from the top down, as the first cloudy band.
5. Carefully remove the clear yellow-colored upper phase of the blood, above the PBMC layer, and then use a P1000 micropipette to transfer
the PBMC layer to a 15 mL or 50 mL conical tube.
6. Wash the PBMC twice with PBS, centrifuging cells at 500 x g for 5 minutes each time. The supernatant will be somewhat cloudy after each
wash