a 1-acyl-2-(9Z)-enoyl-sn-glycero-3-phospholipid + S-adenosyl-L-methionine => a 1-acyl-2-(10-methylene)-acyl-sn-glycero-3-phospholipid + S-adenosyl-L-homocysteine + H(+)
a 1-acyl-2-(9z)-enoyl-sn-glycero-3-phospholipid + s-adenosyl-l-methionine => a 1-acyl-2-(10-methylene)-acyl-sn-glycero-3-phospholipid + s-adenosyl-l-homocysteine + h(+)