5-HT4	5-hydroxytryptamine/serotonin 4
CNS	Central nervous system
DMV	Dorsal motor nucleus of the vagus
ENS	Enteric nervous system
FMT	Fecal microbiota transplant
FDA	Food and Drug Administration
GI	Gastrointestinal
GLP-2	Glucagon-like peptide-2
IBD	Inflammatory bowel disease
IBS	Inflammatory bowel syndrome
ITT	Intestinal transit time
LB	Lewy bodies
MPTP	1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine
NMES	Neuromuscular electrical stimulation
PD	Parkinson’s disease
PEG	Polyethylene glycol
SNpc	Substantia nigra pars compacta
TJ	Tight junction
VIP	Vasoactive intestinal peptide