1.14.19.3 alpha-linolenoyl-CoA + 2 ferrocytochrome b5 + O2 + 2 H+ = stearidonoyl-CoA + 2 ferricytochrome b5 + 2 H2O (2) - 1.14.19.3 alpha-linolenoyl-CoA + 2 ferrocytochrome b5 + O2 + 2 H+ = stearidonoyl-CoA + 2 ferricytochrome b5 + 2 H2O molecular mechanisms underlying catalytic activity of delta 6 desaturase 745520 1.14.19.3 linoleoyl-CoA + 2 ferrocytochrome b5 + O2 + 2 H+ = gamma-linolenoyl-CoA + 2 ferricytochrome b5 + 2 H2O (1) - 1.14.19.3 linoleoyl-CoA + 2 ferrocytochrome b5 + O2 + 2 H+ = gamma-linolenoyl-CoA + 2 ferricytochrome b5 + 2 H2O molecular mechanisms underlying catalytic activity of delta 6 desaturase 745520