Usage examples (26)

• In order for humans to see infrared, the spectral sensitivity of some human photopigment would have to be changed.
• Vision scientists knew that retinal, the derivative of vitamin A, was part of every photopigment molecule and that various forms of vitamin A existed.
• For example, he would claim that a photopigment without any linkers or down stream signalling molecules would be useless, and unselectable by natural selection.
• The ability to see the world as humans do, he says, ‘requires an additional sensor—or photopigment—and the nervous system being able to compare the signals.’