Endoplasmic reticulum do not paicipate in
Rough Endoplasmic Reticulum is involved in protein synthesis. EPR also involved in glycosylation of N linked glycoproteins. Exocytic pathway of protein soing is done by both RER & GA (Golgi apparatus) Reference: Harper; 30th edition
Protein synthesis
Muscle contraction
Protein soing
Glycoproteins
Structure and function of protein