Volume 33, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Mouse monoclonal antibodies (McAbs) have been used to characterize the proteins of the asexual erythrocytic cycle of . Three different McAbs react with antigens of the schizont and extracellular merozoite to give a punctate fluorescence pattern. In many cases, such areas of fluorescence were composed of two adjacent, fluorescent bodies; these were distinct from the nuclei. In contrast, McAbs which bound to the ring-stage parasite were not localized, but were diffusely distributed within or around the ring-stage parasite. These McAbs immunoprecipitated five prominent, S-methionine-labeled schizont proteins (p) of M 82K, 70K, 67K, 39K, and 37K. Only p82, p39, and p37 were immunoprecipitated from schizont-labeled ring-stage parasites; thus, it appears that p70 and p67 are modified, degraded, or secreted some time between intracellular merozoite maturation and erythrocyte invasion.


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