Cross section of the epidermis showing the three types of can cells and their location.
Redrawn from: http://www.riversideonline.com/health_reference/Cancer/DS00190.cfm
http://commonsensehealth.com/wp-content/uploads/2013/08/skindiagram.jpg
http://healthfavo.com/wp-content/uploads/2013/09/labeled-skin-diagrams.gif