Gary Whittaker, professor of virology in the College of Veterinary Medicine, is senior author of “Phylogenetic Analysis and Structural Modeling of SARS-CoV-2 Spike Protein Reveals an Evolutionary Distinct and Proteolytically Sensitive Activation Loop,” which published April 19 in the Journal of Molecular Biology. The study of the structure of SARS-CoV-2, the virus that causes COVID-19, reveals a unique feature that could explain why it is so transmissible between people.