Neurotransmitters in a worm (IMAGE) ICFO-The Institute of Photonic Sciences Caption A single worm in which the flavor of chemical neurotransmitter has been replaced by the color of the photon. The cyan neuron is presynaptic to the yellow and red and thus controls their activity using cyan colored light. Credit ©ICFO Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.