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.
Six developmental stages in triplicates consisting of one-spiral whorl stage (C), two-spiral whorl stage (D), early three-spiral whorl stage (F), late three-spiral whorl stage (G), four-spiral whorl stage (J), and juveniles (Y).
