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.
Acetylcholinesterase (AChE) activity (mean ± standard error; mol min−1 mg−1) measured from brain tissues in juvenile Southern leopard frogs (Lithobates sphenocephala) following agrochemical exposure. C = control; Z = atrazine; L = alachlor; N = urea. Capital letters above bars represent statistically significant differences among agrochemicals.
