Cell and Molecular Biology Program, Department of Clinical Sciences, Colorado State University, Fort Collins, CO, USA.|Cell and Molecular Biology Program, Department of Biology, Colorado State University, Fort Collins, CO, USA.|Department of Statistics, Colorado State University, Fort Collins, CO, USA.|Cell and Molecular Biology Program, Department of Clinical Sciences, Colorado State University, Fort Collins, CO, USA.|Cell and Molecular Biology Program, Department of Clinical Sciences, Colorado State University, Fort Collins, CO, USA. Daniel.Gustafson@ColoState.edu.