Abstract
1. Introduction The role of the rough endoplasmic reticulum in the biosynthesis of proteins exported from the cell and intrinsic membrane proteins is well known [l] . Exported proteins are extruded through the membrane into the intracisternal space where post-translational modifications can occur in the rough membranes or other components of the endoplasmic reticulum [2] . It has been suggested that some membrane proteins are inserted directly into the membrane in the course of biosynthesis [3-61. However, recent work suggests that the pathway of biosynthesis of mem- brane glycoproteins is similar to that of exported proteins and involves intracisternal passage to the Golgi apparatus [7,8]. Since highly purified cyto- chrome
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