Abstract
Mouse L cells and COS cells were transfected with either genomic DNA or cDNAs encoding leukocyte differentiation antigens. Positive transfectants were isolated by FACS and cloned by limiting dilution. Transfectants expressing CD4, CD5, CD8, CD25, CD44, two different WC1 gene products and a transfectant expressing an unknown gene product were isolated using these techniques. Antibodies from the various preliminary clusters were analysed for reactivity on these transfectants. The results confirm the fine specificity of mAbs for two alleles of CD4 and CD5; they also subdivide mAbs recognizing CD8 into two groups based on their specificity for the CD8α chain or a combination of both α and β chains. The data also provides support for the clustering of mAbs recognizing CD25 and CD44 based on transfection of cDNAs encoding these specificities. These results reflect the ability of transfection technology to elucidate the fine specificity of mAbs recognizing bovine CD antigens.
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