Light inside the body.
BIOLUMINESCENCE- For the Dim-Witz
"Bioluminescent sensor causes brain cells to glow in the dark
Date:
October 27, 2016
Source:
Vanderbilt University
Summary:
A new kind of bioluminescent sensor causes individual brain cells to imitate fireflies and glow in the dark. The probe is a genetically modified form of luciferase, the enzyme that a number of other species including fireflies use to produce light. "
More…
https://www.sciencedaily.com/releases/2016/10/161027164348.htm