The 2011 Louis A. Bloomfield Lecture will feature Roger Y. Tsien, 2008 Nobel Laureate in Chemistry and professor of pharmacology, chemistry and biochemistry at University of California, San Diego. Tsien will discuss “Breeding and Building Molecules to Spy on Cells in Health and Disease” in the lecture June 8 at 3 p.m. in Wolstein Auditorium. A reception will follow.