Odd-chain FAs 15:0 and 17:0, their potential exogenous and endogenous origin, and their involvement in metabolic pathways. Only flux into and exchange between pools are depicted. AC-CoA, acetyl-CoA; CE, cholesteryl ester; CIT, citrate; FUM, fumarate; ICIT, isocitrate; MAL, malate; MMA-CoA, methylmalonyl-CoA; OAA, oxaloacetate; PL, phospholipid; Prop-CoA, propionyl-CoA; SUCC, succinate; SUCC-CoA, succinyl-CoA; α-KG, α-ketoglutarate.