label: a (9Z,12Z)-octadecadienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = a (9Z)-octadec-9-en-12-ynoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O
label_lc: a (9z,12z)-octadecadienoyl-containing glycerolipid + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) = a (9z)-octadec-9-en-12-ynoyl-containing glycerolipid + 2 fe(iii)-[cytochrome b5] + 2 h2o