FC	Functional constipation
K56-L	Live K56 group
K56-D	Heat-killed K56 group
VIP	vasoactive intestinal peptide
SP	substance P
5-HT	5-hydroxytryptamine
Aqp2	Aquaporins 2
Aqp3	Aquaporins 3
IL-6	Interleukin-6
TNF-α	Tumor Necrosis Factor-alpha
SCFAs	Short-Chain Fatty Acids
LOP	loperamide
PEG 4000	Polyethylene Glycol 4000 powder
FWC	fecal water content
ASV	Amplicon Sequence Variants
PCoA	Principal Coordinate Analysis
PLS-DA	Partial Least Squares Discrimination Analysis
OPLS-DA	Orthogonal Partial Least Squares Discriminant Analysis
ELISA	Enzyme-Linked ImmunoSorbent Assay
VIP scores	Variable Importance in Projection
5-HIAA	5-hydroxyindole-3-acetic acid