About the Authors

Timothy C. Nichols

Roles Conceptualization, Investigation, Methodology, Project administration, Resources, Supervision, Writing – original draft

Affiliation Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Howard Levy

Roles Conceptualization, Funding acquisition, Methodology, Resources, Visualization, Writing – original draft

hlevy@catbio.com

Affiliation Catalyst Biosciences, South San Francisco, California, United States of America

Elizabeth P. Merricks

Roles Investigation

Affiliation Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Robin A. Raymer

Roles Investigation

Affiliation Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Martin L. Lee

Roles Formal analysis

Affiliation Department of Biostatistics, UCLA Fielding School of Public Health, Los Angeles, California, United States of America

Competing Interests

T.N., E.M., and R.R. received a research grant from Catalyst Bioscience, Inc., M.L. is a paid consultant to Catalyst Bioscience, Inc. and H.L. is an employee and stockholder of Catalyst Bioscience, Inc. This does not alter our adherence to PLOS ONE policies on sharing data and materials.