Abstract
Summary Intramembranous microsomal protein-bound sialic acid cannot be removed to any great extent by various washing procedures. After in vivo glucosamine- 3 H prelabeling, rabbit antiserum to rat serum proteins does not precipitate sialic acid associated label. In vivo injected glucosamine- 3 H shows a peak incorporation after 30 minutes into protein-bound sialic acid of Golgi membranes and of soluble cytoplasmic fraction. The incorporation rate into rough and smooth microsomes is much slower, suggesting a possible transfer of some cytoplasmic glycoproteins to the microsomal membranes.
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