Animal cell, illustration
Illustration of the structure of an animal cell. At top is the endoplasmic reticulum (ER). Some parts of the ER are studded with ribosomes (dots), the cell's protein-manufacturing organelles. Also seen are mitochondria (rod-shaped), the sites of energy synthesis within the cell and a centriole (centre). Centrioles are formed from the protein tubulin. They are involved in assembling the spindle that pulls cells apart during mitosis (nuclear division), the separating of the daughter cells after nuclear division and the production of cilia and flagella.., by JULIEN TROMEUR/SCIENCE PHOTO LIBRARY
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