Genes are central components of Human health and disease. Work on the Human Genome Project (an international research effort to map and sequence the human genome in its entirety) has shown how basic human genetics is to human development, health, and disease. Knowledge that specific genes are associated with specific genetic conditions makes diagnosis possible, even in the unborn. Research continues to demonstrate how many common conditions have genetic causes. Many more associations between genetics, health, and disease will likely be identified as scientists complete and refine human genome mapping and sequencing.