If we could simulate human cells completely, we could try to simulate an embryo's initial formation and see what falls apart if you remove various sequences. B

If we could simulate human cells completely, we could try to simulate an embryo's initial formation and see what falls apart if you remove various sequences. Besides that... we need to understand how a cell recognizes its purpose in its local environment - some kind of local communication probably. If we knew what the various environments that control cell responses are, we would have the basis for something like unit tests... and then we could try randomly removing parts of the DNA and see if its failing to perform as expected or not.