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