University of Minnesota spinoff CoreBiome Inc. has been sold to diagnostics company OraSure Technologies Inc. for an undisclosed amount. St. Paul-based CoreBiome assists researchers studying microbiomes, which are collections of microorganisms that live in shared environments ranging from a person's gut to a patch of dirt. Microbiome-related research has exploded in recent years, as scientists more closely examine how microorganisms living in the human body influence health. CoreBiome aids...