1. From the Tumor Microenvironment and Cancer Immunology Program, Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA (Z.-G.S., Y.C., H.-B.P., W.H., J.W.S., W.B.S.); and Department of Biochemistry and Molecular Biology, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Beijing, Republic of China (H.-Z.C.).