ELOVL6 and fibrosis: The analysis of enzymatic activities based on RBC FA composition revealed that both D5D activity (ratio of 20:4n-6/20:3n-6) and ELOVL6 activity (ratio of 18:0/16:0) were lower in patients with advanced fibrosis than in those without advanced fibrosis (p = 0.010; p = 0.014, respectively).