A simple method for the quick and accurate detection of cell fusion utilizing latex particles as cytoplasmic markers was developed and is reported here. The method is particularly useful for demonstrating human skin fibroblast heterokaryons. Ingestion of latex particles did not affect the growth of primary human and established BHK21/C13 hamster fibroblasts. In addition, somatic cell hybridization between hypoxanthine phosphoribosyltransferase-deficient (HPRT-) and thymidine kinase-deficient (TK-) mutants of BHK21/C13 was also unaffected by latex particle ingestion.
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