Technology Review: Imaging Cholesterol Buildup in the Heart: " Normally, HDL passes through arteries and attaches to low-density lipoprotein (LDL), or 'bad' cholesterol, carrying it out of arteries to the liver."

'Course that's not what the article is about. Researchers have found a way to attach markers to segments of unstable arterial plaque, using altered HDL. As a result, they can better see where unstable plaque has built up in a patient and can better identify problems which increase the risk of heart attack.