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Gene, actn-3. they say this gene really impacts muscle fibers and can tell you if your child will be better in endurance sports or powersports. is it true that one gene can tell you a little bit about the muscles in your body? >> so from what i understand about this is they're looking at exactly what you say, this one particular gene that basically will put you in one of three categories. whether you have this gene, whether you have two copies of this gene, one copy or know copies. everyone in the world will fall into one of these three buckets. sort of like saying are you a brunette, are you ...

The length of your arm, length of your leg to determine how big you're going to get later on. this test as well as those measurements is feeding parents' drive to win. is this too much just adding to that fever? >> yeah, i think so. and the idea that just one gene or one thing can actually bring this about for a child is really the problem here, because that's just not the case. so putting all this emphasis on one gene is not helpful, i think, for the child or the parents. >> all right. dr. jeffrey vance, you're talking about a.c.t.n-3 as one of the genes they're looking at. appreciate you sto...