When you use HAT medium in the hybridoma protocol, it will kills any unfused myeloma cells that might outgrow the other weaker hybridoma cells. Unfused B cells have limited powers of division and will die off naturally in culture. So after 10-21 days, if any cells are growing (or media turn yellow), you can start to screen for your antibody. Hope this helps. Good luck!
Atefeh if you have access to a flow cytometer/fluorescent microscope you can determine the efficiency of your fusion procedure and identify where you are losing your hybridomas. If you can access a cell sorter you can isolate live hybrids and clone them directly into growth supportive conditioned media ± irradiated feeders? Label each partner with a non-toxic tracker dye , prior to fusion process, with appropriate laser illumination you can evaluate efficiency of your fusion procedure via dual labelling in the hybridomas. With appropriate tracer selection you can also add in a viability dye .
hi Atefeh if you're still having issues have download our paper from research gate -Fusion hybrids of dendritic cells and autologous myeloid blasts as a potential cellular vaccine for acute myeloid leukaemia