On a basic 31 kDa muscle membrane protein in cattle and pig, presumably equivalent to the class II antigen associated p31 molecule

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Abstract
In man, the class II antigen associated glycoprotein p31 (also called Ii, In, M1, DR.gamma., XM1) is expressed not only in the membranes of B lymphocytes but also in those of muscle, liver and brain. It can therefore be assumed that the p31 is not really associated with the human class II antigens but is a ubiquitous molecule. The muscle membranes of cattle and pigs contain corresponding polypeptides, with a MW of .apprx. 31 kDa [kilodalton] and an isoelectric point around 7.5, which comigrate in 2-dimensional electrophoresis with p31 derived from the human muscle. In cattle and pigs too, these proteins seem to be equivalent to the class II antigen associated p31, showing a tissue distribution wider than observed up to now. The molecules can be concentrated by ion-exchange chromatography.

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