photogene

Etymology 1
From.

Noun

 * 1)  A photograph.
 * 2)  An afterimage.
 * 3) * 1864-1898,, Principles of Biology
 * In youth, the visual apparatus is so quickly restored to its state of integrity , that many of these photogenes, as they are called , cannot be perceived.

Etymology 2
From

Noun

 * 1)  A gene involved in photosynthesis.