trace

Researchers were able to uncover traces of natural selection -- signs of genetic adaptation to environmental pressures -- that are undetectable in the DNA of modern Europeans.

While toxic in high concentrations, copper is essential to life as a trace element.

“Drinking was a 15-year pattern” but the “Equalizer” star said it could be traced back to long before his Hollywood days.

Relatives of the friend refused to accept she died of natural causes and an autopsy found traces of cyanide in her body.

To test this, they first consulted a neural connectivity database and then did experiments to trace the connections between these different brain areas.