UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN, NEWS BUREAU IMAGE: ERIK NELSON AND HIS COLLEAGUES FOUND THAT A BYPRODUCT OF CHOLESTEROL METABOLISM CAUSES SOME IMMUNE CELLS TO SPEW OUT CANCER-PROMOTING SIGNALS. NELSON IS A PROFESSOR OF MOLECULAR AND INTEGRATIVE PHYSIOLOGY AT THE UNIVERSITY OF ILLINOIS URBANA-CHAMPAIGN. CREDIT: PHOTO BY L. BRIAN STAUFFER CHAMPAIGN, Ill. — Scientists working...