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Using monoclonal antibodies and electron microscopy, we have localized N-acetylglucosamine transferase I within the Golgi apparatus. This enzyme initiates the conversion of asparagine-linked oligosaccharides to the complex type. We have found that the enzyme is concentrated in the central (or medial) cisternae of the Golgi stack. Cisternae at the cis and trans ends of the Golgi complex appear to lack this protein. These experiments establish a function for the medial portion of the Golgi and imply that the Golgi is partitioned into at least three biochemically and morphologically distinct cisternal compartments.
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