Each section of the gastrointestinal, or GI, tract plays a role in digestion of food and hence has distinct structural as well as molecular differences. (sciencedaily.com)
Does x «units» of molecular difference between the two lineages always imply a shared ancestor y years ago? (newscientist.com)
Her research is part of growing evidence that has yielded an entirely new understanding of molecular differences reflected in the brain between men and women, and how outside forces can permanently imprint neurological circuitry in sex - based ways. (discovermagazine.com)