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.
Ion maps of cholesterol ([M-H2O+H+]+) before and after the optimization of the electrospray flow rate and spray voltage. Flow rate and spray voltage were decreased in order to improve signal abundance. The tissue boundary is illustrated using the dotted line.
