A series of prostaglandin F2-like compounds are produced in vivo in humans by a non-cyclooxygenase, free radical-catalyzed mechanism. - Morrow,J.D.; Hill,K.E.; Burk,R.F.; Nammour,T.M.; Badr,K.F.; Roberts,L.J. (Proc Natl Acad Sci U S A, 1990)