every cell of our bodies, there is a written plan that explains how that cell should make all of the things that it needs to make. a cell that grows hair is very different to a cell that is in your heart or brain. however, all cells still have the same plan but different parts of the plan are turned on in different cells.
we first understood what the full plan looks like for humans in 2003. we can use computers to make sense of the plan and to learn more about how many parts are needed to make a human (about 20,000). the better we understand the plan, the more 