noun
lipoprotein
Biochemical term for a complex of lipid and protein that transports fats in the blood.
リポ蛋白質は血中のコレステロールを運ぶ役割をしている。
Lipoproteins play a role in transporting cholesterol in the blood.
リポタンパク質 is a more common full-katakana spelling for the same term; リポ蛋白質 uses the kanji 蛋白 for 'protein'.
From English 'lipoprotein', combining 'lipo-' (fat) and 'protein'. The kanji 蛋白質 is the Japanese term for protein.