Immunoreactivities of MAbs. Immunoreactivity of anti-SARS CoV N protein MAbs. The immunoreactivity of each MAb to full-length recombinant His6-tagged N protein is shown: •, I-16; ▪, I-23; ▴, II-3; ⧫, II-12; and ○, II-21. The reactivities of serially diluted MAbs were measured in duplicates on a microtiter plate coated with full-length recombinant N protein. The mean value for 0 μg/ml of MAb was 0.042. Results show the means of net values (the mean value for each concentration of MAb/the mean value for 0 μg/ml of MAb).