Institution: | aVerna Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas, USA;bDepartment of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, USA;cDepartment of Medicine, Baylor College of Medicine, Houston, Texas, USA;dBerkeley Center for Structural Biology, Lawrence Berkeley National Laboratory, Berkeley, California, USA |