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Abstract
The monoclonal antibody-specific immobilisation of erythrocyte antigens (MAIEA) test has been employed to investigate the Kell system using five monoclonal antibodies which recognise high frequency epitopes on the 93,000-molecular weight Kell glycoprotein: BRIC 18, BRIC 68, BRIC 107, BRIC 203 and 6-22. BRIC 107, which has anti-k-like (KEL2) specificity, identifies a distinct epitope, whilst competitive binding assays suggested that BRIC 203 (anti-Kp^bc), BRIC 18, BRIC 68 and 6-22 (anti K14) comprise an overlapping set of epitopes. The MAIEA assay has been very successful in confirming the assignment of most of the Kell and para-Kell antigens to the Kell protein. Due to the competitive nature of the assay and the fact that the monoclonal antibodies bind to different regions, the results also suggest the relative positions of some of the Kell antigens on the Kell protein; these appear to be located in at least five spatially distinct regions.
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