
Keywords: 5-HIAA; 5-hydroxyindoleacetic acid; BDNF; brain derived neurotrophic factor; CRD; colorectal distension; EDTA; ethylenediaminetetraacetic acid; EPM; elevated plus maze; FST; forced swim test; GF; germ-free; HPA; hypothalamic-pituitaryadrenal; HPLC; high