That contrasts with most previous studies, which conclude that we only reached this level of transformation about 100 years ago. (newscientist.com)
Unlike most previous research, this study directly compared medical cannabis users with a control group of chronic pain patients who did not use the drug. (scientificamerican.com)
In most previous in vivo gene therapy experiments, researchers have used viruses to carry the DNA into the patient's tissues. (uchospitals.edu)