On March 11, Jay D. Keasling, member of National Academy of Engineering, professor of University of California, Berkeley, delivered Zhang Dayu lecture (XXXI) entitled "Engineered Polyketide Synthases as Platform for Synthetic Chemistry" . After the lecture, Prof. Keasling visited our group, and had a deep discussion with our group members. (Text by Yunxia Li, Image by Xiaojing Ma)