<prompt> Methods of producing fusion of cells are AEAttaching inactive viral paicles on cell membraneAdding polyethylene glycolApplying a small electric currentReducing surface tension  <response>: D i.e. Reducing surface tension Cell fusion eg. as used in hybridoma technique to produce monoclonal antibodies can be brought about by - Exposure to polyethylene glycol gelQ - Electric field induced i.e. applying small electric current cell fusionQ - Laser induced cell fusion - Attaching inactive viral paiclesQ like inactivated rota virus and Sendai virus. 