Abstract.Peripheral blood mononuclear cells of an immunized patient were transformed with Epstein‐Barr virus and then fused with P3X63Ag8mouse myeloma cells by polyethylene glycol. After the cloning, a hybridoma cell line secreting specific anti‐Jkbmonoclonal antibody was isolated. The antibody was produced in supernatant form and tested for its use as a blood grouping reag
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