Melanopsin Spontaneously Releases the Chromophore Retinal (image) National Institutes of Natural Sciences Share Print E-Mail Caption A mammalian photoreceptive protein melanopsin spontaneously releases the chromophore retinal. The property would be important to regulate non-visual photoreception in mammals. Credit IMS/NINS Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.