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.
Error bars represent SEM. Asterisks indicate significant differences within pubertal subgroups between normal controls and patients with autism: *P<0.01,**P<0.001. Among the total group of individuals with autism, both pre-pubertal and pubertal individuals had significantly higher β-endorphin levels than post-pubertal individuals (P<0.01).
