Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Linear regression of sample collection dates against divergence from the root of reconstructed maximum-likelihood trees from FMDV VP1 sequences. Circles representing tip nodes are colored according to the corresponding FMDV lineage. Fitted lines are shown with their estimated 95% confidence interval regions. R-squared (R2) and slope (β) parameters estimated for each fitted regression line are reported.
