Abstract

SummaryPronase‐treated cattle red cells (CRC) from different monozygous (MZ) twin pairs could be classified as weakly (titre 1: 2, 1: 4) or strongly (titre 1: 1024, 1: 4096) agglutinable when Phytohemagglutinin‐M (Phy‐M) was used as agglutinin. In the presence of concavalin‐A (Con‐A), the CRC from different MZ pairs treated with pronase, A‐chymotrypsin or trypsin showed a gradation from low (titre 1: 32) to high (titre 1: 256 000) agglutinability. The trypsin‐treated CRC which had A1, A2 blood factors usually had a titre of 1: 8000 or higher with Con‐A. Both the intact CRC and the CRC treated with proteolytic enzymes were capable of absorbing the Phy‐M or Con‐A lectins.

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