A membrane fraction (SN 4), prepared from developing and mature rat forebrain by hypo-osmotic treatment of microsome (microsomal-fraction)-free myelin, appears to be closely related to the myelin-like fraction. Fraction SN 4 shows 2':3'-cyclic nucleotide 3'-phosphohydrolase activity higher than that of the parent myelin. Electrophoresis reveals a multitude of bands with the Wolfgram protein as the main component.
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Thomas V. Waehneldt (1975) studied this question.
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