Complex sentence: A diverse array of neurotransmitters and receptors contribute to acupuncture analgesia, including opioids, glutamate and NMDA receptors, serotonin and cholecystokinins.
Split into simpler sentences: A diverse array of neurotransmitters and receptors contribute to acupuncture analgesia. These include opioids, glutamate and NMDA receptors, serotonin and cholecystokinins.