Tell me more about what you mean by that. FRANCIS COLLINS: Well, growing up, I was vaguely aware of things that went on in church, because I was in the boys' choir at the local Episcopal church.

Collins: That sounds apocryphal to me, but it's a great story. Krulwich: Is that the sort of thing? That is, depending upon how you read the genes you can get different end products? Collins ...

I'm Dr. John Whyte, Chief Medical Officer at WebMD. Today, I have a very special guest-- Dr. Francis Collins, the Director of the National Institutes of Health, the only director, by the way that ...