Three lectins:Lecl, Lec2, Lec3, which showed strong hemagglutination effect on rabbit red blood cells(RBCs), have been isolated from leaves of Aloe vera L. var. chinensis Haw, Aloe barbadensis Mill and Aloe arborescens Mill by DEAE-cellulose chromatography and gel filtration. They are glycoproteins tested by special colour reactions and SDS-PAGE with molecular weight of 23kDa, 26kDa and23kDa. Lec2 from Aloe barbadensis Mill and Lecl from Aloe chinensis showed the higher hemagglutinating activity ...