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.
HB: horn buds+frontal bone, FS: frontal skin+frontal bone. *p<0.05 and **p<0.01 (Fischer’s test). P-values were not calculated for expression levels in tissues from TWIST1+/− and PMS fetuses due to the small number of individuals investigated.
