A Feliway Diffuser contains synthetic copies of feline facial pheromones known to support peaceful attitudes, and may help your cat to relax and enjoy the company of people and animals. (best-cat-art.com)
Science has inserted a synthetic copy of DNA into a living cell membrane. (religion.blogs.cnn.com)
Most tests for HIV are based on a process known as ELISA, or enzyme - linked immunosorbent assay, which uses proteins from the virus or synthetic copies. (newscientist.com)