The main chemical components of endoplasmic reticulum are proteins and lipids. It contains protein 60-70% and lipid 30-40%. Asymmetric lattice contains ATP and glyoxysomes. Besides, it contains 15 types of enzymes and co-enzymes. Enzymes are – glucose 6 phosphate, NADH diaphorase, active ATP-ase, glycosyl transferase, NADH cytochrome reductase, stearase, esterase, nucleotide diphosphatase, peptidase, fatty acyl CoA dehydrogenase etc.