Abstract
In the previous paper, the present authors reported on diminution in agglutinability of trypsin-treated M and MN red cells with anti-M IgG antibody. This paper deals with the time course of changes in agglutinability and quantitative differences of M agglutinogen of red cells. M agglutinogen of M red cells disappeared much faster than that of MN, and the lowest titer of anti-M IgG antibody to agglutinate M red cells was higher than that to agglutinate MN red cells. The significant difference of agglutination scores was observed in the frequency distribution in 100 cases of M and MN red cells each. Subgroups such as M1 and M2 in M agglutinogen of trypsin-treated red cells reacting with anti-M IgG antibody were unsettled.
