Rab9 is hyperactive in NPC1-deficient cells to ensure transport of this molecule. Enzymes in the endoplasmic reticulum's membrane convert squalene to 
Rab9 is hyperactive in NPC1-deficient cells to ensure transport of this molecule. Enzymes in the endoplasmic reticulum's membrane convert squalene to this molecule, whose derivatives include bile acids and Vitamin D. Crystals of this molecule form during atherosclerosis, and this molecule can be carried by both high-density and low-density lipoproteins. For 10 points, name this lipid and precursor to steroid hormones.
Rab9 is hyperactive in NPC1-deficient cells to ensure transport of this molecule.
{cholesterol}