Professor Jamie Davies is Professor of Experimental Anatomy at the University. During fetal life, cells have hidden conversations with each other as they build our tissues, such as kidney, heart and liver. In order to build tissues for ourselves, we need to speak their language. This lecture will reveal the clues we have picked up to help build tissues in the laboratory, which could help save the lives of people requiring an organ transplant. This lecture is part of the Medical Detectives, a series of public lectures that show how keen detective work is still essential for 21st century doctors: http://www.ed.ac.uk/news/events/medical-detectives/ Recorded on Thursday 11 November 2010 in the Anatomy Lecture Theatre at the University of Edinburgh.