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.
All Images
Sterile Nicotiana tabacum plants growing in nutrient agar.
Credit: PhylloTech
Download the high-resolution JPEG version of the image. (100.7 KB)
Use your mouse to right-click (Mac users may need to Ctrl-click) the link above and choose the option that will save the file or target to your computer.
