I want to detect Rad51 foci with HCC1599 (Suspension cell) and I do not know if this is possible or not. The difficulty is that normally the cells we used are adherent and I do not have experience with Suspension cells.
You can fix and stain the cells in suspension, then let them settle onto poly-l-lysine coated coverslips. They will loosely adhere but enough that you can add your mounting media and mount your coverslips.