Illustration of the ultrastructure of a typical cell. The anatomical components of this cell are seen in three-dimensions and colour-coded. The outer cell membrane (brown) is furrowed, with the inner cytoplasm coloured white. A central nucleus with nucleolus (green) houses the genetic material and has a membrane with pores. Continuous with the nucleus is the endoplasmic reticulum (ER, yellow), a membrane system in the cytoplasm studded with ribosomes (blue dots). A golgi body (blue membrane structure) receives glycoproteins from the ER. Four mitochondria (coloured magenta) store energy for the cell and engage in aerobic respiration.