Abstract
A heterogeneous protein fraction has been extracted from myelin with properties different from the basic encephalitogenic protein or the Folch-Lees proteolipid protein. The major component of the protein fraction extracted from myelin with 0.014 M thioethanol migrated with an intermediate mobility between that of the encephalitogenic protein and that of the proteolipid protein on 7.5% polyacrylamide gel at acid pH. The amino acid composition of the fraction was different from both that of the encephalitogenic protein and that of the proteolipid protein. However, the amino acid composition was very similar to fractions of myelin obtained by Wolfgram and Eng et al. There were small amounts of glucose and galactose present, but no focose. The protein fraction was tested in guinea pigs for EAE activity, and it was shown to be encephalitogenic.
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