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Subcellular localization of complex carbohydrates in rat macrophages and monocytes.

Methods for visualization of complex carbohydrates ultrastructurally were employed to study specific organelles of the rat monocyte and macrophage. Vicinal glycols of glycoconjugates were demonstrated with the periodic acid-thiocarbohydrazide-silver proteinate (PA-TCH-SP) postembedding sequence and acid groups were delineated by the dialyzed iron (DI) and high iron diamine (HID) preembedding techniques. Lysosomal bodies were generally found reactive with all three methods, although those of monocytes from the bone marrow and peripheral blood were notably lacking in acidic groups. The Golgi complex was consistently PA-TCH-SP-reactive, as were associated vesicles and occasional cisternal expansions, possibly related to GERL. Numerous cytoplasmic vesicles and small granulated structures and cisternae of the rough endoplasmic reticulum were also PA-TCH-SP-reactive.