an (8Z,11Z,14Z)-icosatrienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = (5Z,8Z,11Z,14Z)-eicosatetraenoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O
an (8z,11z,14z)-icosatrienoyl-containing glycerolipid + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) = (5z,8z,11z,14z)-eicosatetraenoyl-containing glycerolipid + 2 fe(iii)-[cytochrome b5] + 2 h2o
an (8Z,11Z,14Z)-icosatrienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = (5Z,8Z,11Z,14Z)-eicosatetraenoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O
an (8z,11z,14z)-icosatrienoyl-containing glycerolipid + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) = (5z,8z,11z,14z)-eicosatetraenoyl-containing glycerolipid + 2 fe(iii)-[cytochrome b5] + 2 h2o