Abstract
Analysis of rat red blood cell (RBC) cytosol protein fraction after in vivo phenylhydrazine treatment revealed increased amounts of 68-kDa protein. This protein is present in trace amounts in normal rat RBC cytosol. We also present data that 68-kDa protein from RBC cytosol has an identical isoelectric point, partial proteolytic map and immunological determinants as a protein of the same molecular mass from rat exosomes. These data indicate that 68-kDa protein is normally present in rat RBC cytosol, is exported via exosomes during reticulocyte maturation, and is increased in induced haemolytic anaemia.
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