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.
Each point represents one individual, self-assessed as Whites (red triangles), Browns (blue dots) and Blacks (black asterisks). We ran the Principal Component Analysis (PCA) using three variables: Pigmentation Index (PI), African ancestry and Amerindian ancestry. The PCA and the plot were done using R program, v. 3.0.0 [51].
