21. Human eyes have color receptors known as cone cells , of which there are three types. 22. The company has not measured the electrical activity of the cone cells in the long term, 23. Unlike in most systems, rod and cone cells release neurotransmitters when not receiving a light signal. 24. Different cone cells respond to different wavelengths of light, which allows an organism to see color. 25. The retina contains rod cells and cone cells . 26. Each cone cell of a bird s retina contains an oil droplet which may contain carotenoid pigments. 27. It poisons that layer, which in turn leads to damage to the cone cells of the macula. 28. Of course, the study was made with fibroblasts and the situation may be different in cone cells . 29. This allowed Wald to determine the absorbance of pigments in the cone cells ( Goldstein, 2001 ). 30. Rod cells are the ones responsible for night vision, and cone cells are responsible for color vision.
