A specialized region of the endoplasmic reticulum--the BFA body--is defined by the site of accumulation of coatomer when nonclathrin coat protein (COP)-coated vesicle assembly is prevented by the drug brefeldin A (BFA). BFA bodies are formed by part smooth, part rough domains of endoplasmic reticulum that are cis to the classical transitional endoplasmic reticulum and to BFA-induced Golgi remnants.
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Orci et al. (1993) studied this question.
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