Cells contain numerous lipid droplets, abundant mitochondria and a complex smooth endoplasmic reticulum. RNA translation occurs inside the endoplasmic reticulum. Enzymes of the lysosomes are synthesised in the rough endoplasmic reticulum. The majority of proteins synthesized in the rough endoplasmic reticulum undergo glycosylation. These structures consist of rough endoplasmic reticulum and associated ribosomal RNA. IP3 binds to receptor proteins in the membrane of the endoplasmic reticulum (ER). Assembly of the icosahedral capsid occurs on modified membranes from the endoplasmic reticulum. Club cells accomplish this with cytochrome P450 enzymes found in their smooth endoplasmic reticulum. Soluble inositol-(1,4,5)-trisphosphate triggers calcium to be released from the endoplasmic reticulum. These enzymes belong to cytochrome P450 group present in the smooth endoplasmic reticulum. Ribosomes are often associated with the intracellular membranes that make up the rough endoplasmic reticulum. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum. STIM1 is a transmembrane protein of the endoplasmic reticulum (ER). Glucose-6-phosphatase is an enzyme located on the inner membrane of the endoplasmic reticulum. The membrane anchor fixes the proteins into the endoplasmic reticulum (ER) and microsome membrane.