Scientists have identified a protein that boosts the signaling power of a receptor involved in relaying messages between brain cells, a finding that suggests a new target for the development of treatments for schizophrenia and Parkinson's disease. The protein, called Norbin, directly interacts with a receptor for the neurotransmitter glutamate, which is critical to the process by which individual brain cells send messages to one another and plays a key role in learning and memory.