Cell (biology) - Wikipedia All the cells in an animal body develop from one totipotent diploid cell called a zygote During the embryonic development of an animal, the cells differentiate into the specialised tissues and organs of the organism
Molecular Expressions Cell Biology: Animal Cell Structure Animal cells are typical of the eukaryotic cell type, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles Explore the structure of an animal cell with our three-dimensional graphics