<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Explain the function of neurotransmitters in the brain. Context: Neurotransmitters play a vital role in brain function by transmitting signals between neurons, influencing mood, behavior, and cognitive processes. Answer: [/INST]It is to transmit signals between neurons, enabling communication within the brain and regulating various brain functions, such as mood, behavior, and cognition.</s>