AMHERST, Mass. - Lila Gierasch, head of the department of biochemistry and molecular biology at the University of Massachusetts, will discuss "The Unfolding Story of Protein Folding" in her upcoming Distinguished Faculty Lecture. The presentation is scheduled for 4 p.m. on Wed., Feb. 23 in Memorial Hall, and is the third in this year''s Distinguished Faculty Lecture series. Gierasch will receive a Chancellor''s Medal following her lecture. The Chancellor''s Medal is the highest honor bestowed by the campus on individuals for exemplary and extraordinary service to the University. A reception will follow.