Secretor Status of ABO Antigens in Saliva of a Defined Group of Iranian Patients with Pemphigus Vulgaris: A Case-Control Study

Figure 1

Agglutination is observed in the two tubes at the right side with the signs A and B; it indicates the absence of these antigens in the saliva. In a tube with the O sign, the absence of agglutination indicates the presence of H antigens in saliva. The fourth tube with the C mark is the control tube; absence of agglutination indicates the absence of nonspecific agglutinins in the saliva.