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 on each column indicate SEs from three replicates. A, apical stem segment; M, middle stem segment; B, basal stem segment.
