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Intracellular localization of glycosylated attractin. Immunogold electron microscopy using rabbit polyclonal antiattractin. (A) Resting T lymphocyte with no evidence of attractin expression. (B) In T cells activated for 48 hr with PHA, attractin is expressed in large vacuoles. (C) Attractin often localizes in vesicles with electron dense core. (D) Vesicles containing attractin break open at the cell surface releasing attractin.
