Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Tangier's disease leads to irregular export of this molecule from macrophages due to defective ABCA1 protein transporters. Overexpression of Rab9 can lead to restoration of its transport in NPC1-deficient cells and the StAR protein controls its transfer within the mitochondria. Mevalonate and squalene are precursors to this molecule that is prevalent in mammalian plasma membranes. Levels of it can be reduced with HMG-CoA reductase inhibitors, which are commonly called statins, an example of which is the drug Lipitor. For 10 points, name this steroid that attaches to lipoproteins such as HDL and LDL.
A:
Science