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.
Mutation accumulation in porcine H1N1. Solid line = porcine regression. Dashed line = the human regression line from Figure 3. There is considerably more variability among the porcine versions of H1N1, and there was a significant difference in the two slopes (ANCOVA, p=0.0001).
