STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Foetal tooth. Coloured light micrograph showing an unerupted foetal tooth. The first set of teeth begin to develop around six weeks after conception. The permanent teeth begin to develop around a month after this. The foetal tooth is capped with a layer of enamel (red), with a layer of dentine (pink) beneath this. The pale region below these is the pulp. A layer of tissue above the enamel (purple, top) is made up of epithelial cells. Magnification: x160 when printed 10cm tall.
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