1.   But the application that excites doctors at least as much is manipulating microbiotic genes in ways that help the immune system fight off many cancers and heart disease.

2.   One died because it was illegal for physicians to remove her clothing to treat her burns, lest the doctors become sexually excited even by charred nudity.

3.   That, claims Navarro, has doctors most excited.

4.   Doctors are excited by the idea of so-called xenotransplants due to a worldwide shortage of human transplant organs.

5.   Many doctors are excited by the idea of so-called xenotransplants due to a worldwide shortage of human transplant organs.