SOUTH SAN FRANCISCO, Calif.--(BUSINESS WIRE)--Joined by scientists from VistaGen Therapeutics here, a team of leading Canadian, American and British medical researchers have used embryonic stem (ES) cells differentiation cultures to successfully identify, grow and study the earliest cell destined to form the human heart. This novel cardiac stem cell is able to produce all three types of cells important to the cardiovascular system. The research was published today in the scientific journal Nature, in a paper entitled, ”Human cardiovascular progenitor cells develop from a KDR embryonic-stem-cell-derived population.”