Neuron expression (IMAGE) University of California - San Diego Caption In normal mice (left), magenta neurons express the excitatory transmitter glutamate and green neurons express the inhibitory transmitter GABA. Methamphetamine (right) causes glutamate-expressing neurons to express GABA, demonstrated by neurons co-expressing magenta and green labels (arrowheads) in methamphetamine-treated mice but not in untreated mice (normal). Credit Spitzer Lab, UC San Diego Usage Restrictions Must be used in conjunction with Nature Communications paper on neurotransmitter switching and drug abuse. License Original content 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.