1-Palmitoyl-2-docosahexaenoyl-sn-glycero-3-PE, a phospholipid comprising palmitic acid (at the sn-1 position) and docosahexaenoic acid (at the sn-2 position), is present in the nucleus of mouse liver but absent from mitochondria. Notably, its levels in pre-term infant plasma are lower compared to those in maternal or fetal plasma.