Precursor of AA is DGLA (dihomogammalinolenic acid) which is a successor of (omega-6) LA. The enzyme d5d (delta-5-desaturase) catalyses the genesis of AA. This step is competetively limited by omega-3 fatty acids beeing catalysed to EPA.
Eicosanoids are not precursors of AA, but are made of AA.
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