An official website of the United States government
Here's how you know
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.
Dissection of the 340-bp ASE region. (A)
Structures and activities of 501/301hsp-based
deletion mutants. Each nodal fragment was linked to the
hsp68 promoter and lacZ. (B) X-gal staining
patterns of representative transgenic embryos.