Biophoton

A biophoton (from the Greek βίος meaning "life" and φῶς meaning "light"), synonymous with ultraweak photon emission, low-level biological chemiluminescence, ultraweak bioluminescence, dark luminescence and other similar terms, is a photon of light emitted from a biological system and detected by biological probes as part of the general weak electromagnetic radiation of living biological cells. Biophotons and their study should not be confused with bioluminescence, a term generally reserved for higher intensity luciferin/luciferase systems.