Researchers at Israel’s Bar-Ilan University are developing gold nano-rods to help identify and treat blocked arteries. The tiny gold particles are absorbed by macrophages (cancer-eating white blood cells) to illuminate problem areas. Combining them with good cholesterol can then clear the blockages.

http://www.timesofisrael.com/israeli-study-uses-gold-particles-to-search-and-destroy-artery-blockages/