Gal / GalNAc-specific lectin. Agglutinates both native and trypsin-treated rabbit erythrocytes but not human erythrocytes irrespective of blood group type. Endohydrolysis of the N-glycosidic bond at one specific adenosine on the 28S rRNA. Disulfide-linked heterodimer of A and B chains. Belongs to the ribosome-inactivating protein family.