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Subfractionation by density equilibration and by differential sedimentation in density gradients has resolved rat liver microsomes into several populations of subcellular components characterized by specific marker enzymes (1, 7). Vesicles derived from endoplasmic reticulum (ER) 1 were found to be heterogeneous, both in their physical characteristics and in their enzyme content. On the basis of these results, E R enzymes have been classified into two groups. Group b includes cytochromes b~ and P 450, and other oxidoreductases related to these hemoproteins; group c includes glucose 6-phosphatase, several other microsomal hydrolases, and glucuronyltransferase. With respect to enzymes of group b, those of group c sediment faster and equilibrate at higher densities in various gradients (1, 7). Furthermore, their

ULTRASTRUCTURAL LOCALIZATION OF CYTOCHROME b5 ON RAT LIVER MICROSOMES BY MEANS OF HYBRID ANTIBODIES LABELED WITH FERRITIN