DEET has been in use as an insect repellent since 1946. Insensitive mutant insects are known but in most cases it's still effective. The more distinct mechanism

DEET has been in use as an insect repellent since 1946. Insensitive mutant insects are known but in most cases it's still effective. The more distinct mechanisms of action we have available the less likely insensitivity will become a problem, so it's worth identifying the active compound in chicken odor.