Fig. 1. Main putative RBH path-
ways. When cis or trans configura-
tions are not mentioned, it means
that the various cis-cis, cis-trans
and trans-trans configurations
could exist. Thick arrows represent
the major pathways [26]; thin arrows
represent other putative pathways,
as suggested by increases in the
corresponding isomers during in
vitro incubations of pure linoleic and
linolenic acids [46]; dotted arrows
represent RBH pathways including
unknown 18:3 isomer inter-
mediates. Not all putative FA are
mentioned, and the numerous
interconversions among 18:1 iso-
mers [47, 48] are not represented.