UCLA researchers have produced the clearest 3-D images to date of the virus that causes cold sores, herpes simplex virus type 1, or HSV-1. The images enabled them to map the virus’ structure and offered new insights into how HSV-1 works. A report on the research was published online by the journal Science. The scientists used cryo electron microscopy, or cryoEM, to obtain the first atomic model of the virus particle, which is made up of more than 3,000 protein molecules comprising tens of millions of atoms.