Therefore, strenuous efforts have been made to reduce the content of the ortho isomers in commercial TCP if there is a risk of human exposure. However, researchers at the University of Washington found that non-ortho TCP isomers present in synthetic jet engine oils do inhibit certain enzymes.
The original statement highlights the measures taken to reduce the content of ortho isomers in commercial TCP when there is a potential risk of human exposure. In contrast, research by the University of Washington discovered that certain non-ortho TCP isomers present in synthetic jet engine oils can inhibit enzyme activity.