Abstract
Abstract. Stromata of blood group A1 erythrocytes fragmented by ultrasound were studied by means of double diffusion in gel. In many instances the reactions with immune anti‐A sera were composed of two lines. Evidence was presented that group A1 secretor saliva contains all the A antigenic specificities present on the stromata. On the other hand, group A1 secretor serum appeared to be antigenically poorer than stromata. The reaction line with group A1 stromata was stronger than with group A2 stromata. Some evidence for a qualitative antigenic difference between the group A1 and A2 stromata was also obtained. Phaseolus limensis lectin produced a reaction line with group A1 stromata. Data were presented in support of the existence of two populations of stromal particles, one combining with this lectin and anti‐A serum and the other with the antiserum only. The first population of particles could be eliminated from the stromal suspension without influencing the reactivity of the sedond population.
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