CELL0001/CELL0002 covers cellular and molecular events which underlie animal development and cell differentiation, drawing on examples from a range of vertebrate and invertebrate organisms: Xenopus, Chick, Mouse, Zebrafish, C. elegans, Drosophila melanogaster and Sea urchins. The lectures are common to 15-credit module CELL0001 and 30-credit CELL0002, but the latter also includes a series of compulsory practicals.