A cytochrome P450 monooxygenase that may play a role in retinoid and phospholipid metabolism. Catalyzes the hydroxylation of saturated carbon hydrogen bonds. Hydroxylates all trans-retinoic acid (atRA) to 4-hydroxyretinoate and may regulate atRA clearance. Other retinoids such as all-trans retinol and all-trans retinal are potential endogenous substrates. Catalyzes both epoxidation of double bonds and hydroxylation of carbon hydrogen bonds of the fatty acyl chain of 1-acylphospholipids/2-lysophospholipids. Can metabolize various lysophospholipids classes including lysophosphatidylcholines (LPCs), lysophosphatidylinositols (LPIs), lysophosphatidylserines (LPSs), lysophosphatidylglycerols (LPGs), lysophosphatidylethanolamines (LPEs) and lysophosphatidic acids (LPAs). Has low or no activity toward 2-acylphospholipids/1-lysophospholipids, diacylphospholipids and free fatty acids. May play a role in tumorigenesis by activating procarcinogens such as aflatoxin B1, polycyclic aromatic hydrocarbon dihydrodiols and aromatic amines. Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase). all-trans-retinoate + O2 + reduced [NADPH--hemoprotein reductase] = all-trans-4-hydroxyretinoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 1-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + O2 + reduced [NADPH--hemoprotein reductase] = 1-[8-hydroxy-(9Z)-octadecenoyl]-sn-glycero-3-phosphocholine + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 1-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + O2 + reduced [NADPH--hemoprotein reductase] = 1-[11-hydroxy-(9Z)-octadecenoyl]-sn-glycero-3-phosphocholine + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 1-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + O2 + reduced [NADPH--hemoprotein reductase] = 1-[(9S,10R)-epoxy-octadecanoyl]-sn-glycero-3-phosphocholine + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 1-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + O2 + reduced [NADPH--hemoprotein reductase] = 1-[(9R,10S)-epoxy-octadecanoyl]-sn-glycero-3-phosphocholine + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Detected in colon, ileum, and testes. Belongs to the cytochrome P450 family.