We know specific genes are turned on in specific cells, but we don't know to what extent this happens.
Walter GilbertIn 15 years we'll have all the sequence, a list of the genes everyone has in common and those that differ among people. We know only something like a tenth of 1 percent of the sequence at the moment.
Walter GilbertWe haven't been able yet to determine in terms of genes what makes a human being a human and not another mammal.
Walter Gilbert