That job is to communicate with other neurons by sending tiny chemical messages from one cell to another. (en.hdbuzz.net)
One group is dedicated to passing chemical messages and is crucial for the brain to function - we'll call them «good» channels. (en.hdbuzz.net)
Once the fluorescent chemical message binds to the receptor on the surface of the stem cell, the stem cell will «light up» under fluorescent light. (science.howstuffworks.com)