"-- the old way does n't hold water ."
"What ? The understanding of HOX genes has n't actually changed the understanding of mutations to other genes . It has added an additional dimension . I 'm not sure what you mean by `` the old way , `` but an understanding of regulatory genes does not negate anything that went before . It only adds understanding . Sadly , you do n't seem to understand ."
"the old way does n't hold water ."
"It only adds understanding ."