Crystal Violet Staining (for Focus Formation Assay)
Place plates on ice.
Wash two times with ice-cold 1X PBS.
Fix cells with ice-cold methanol (stored at –20oC) for 10 minutes.
Aspirate methanol from plates, move off ice and add enough 0.5% crystal violet solution (made in 25% methanol and stored at room temperature) to cover bottom of plate.
Incubate at room temperature for 10 minutes.
Pour off crystal violet solution into a beaker (can re-use).
Carefully rinse plates in ddH20 until color no longer coming off in rinse.
Allow plates to dry at room temperature (may take overnight).