appetite hippocampus PPARγ Cancer cells NADA anti-inflammatory substantia nigra Plant Cannabinoids THCA TRPV1 CBD pancreas stem CBGA OEA TRPV3 PPARα Other Disorders & Therapeutic Uses GPR55 immune system hippocampal CBN Metabolic Disorders GPR119 thalamus Brain Disorders CBDA nervous system Diseases Pain cerebellum PEA CBDV microglia Terpenes Anandamid TRPM8 CBG Endocannabinoids TRPA1 CB2 9THC Cannabinoid Receptors Immune Disorders memory CBC THCV Anandamide TRPV2 THC tumor TRPV4 CB1 2AG Δ9THC NarGly Brain Synthesizing & Degrading Enzymes putamen