Breadcrumb Home DAPI Staining for DNA Content Reagents 10µg/ml DAPI (4'-6-diamidino-2-phenylindole dihydrochloride) in PBS with 0.6% NP40 (Nonidet P40) Staining Centrifuge 1 x 106 cells to a pellet and carefully remove supernatant. Loosen pellet. Resuspend pellet in 1ml of DAPI staining solution. Keep on ice until run on flow cytometer.