GALT	Gut-Associated Lymphoid Tissue
GI	Gastrointestinal
IBD	Inflammatory Bowel Disease
UC	Ulcerative Colitis
CD	Crohn’s Disease
GM	Gut Microbiota
OP	Osteoporosis
BMD	Bone Mass/Mineral Density
OC	Osteoclast
OB	Osteoblast
IL	Interleukin
RANKL	Receptor Activator of Nuclear Factor Kappa-Β Ligand
OPG	Osteoprotegerin
VDR	Vitamin D Receptor
PTH	Parathyroid Hormone
OCN	Osteocalcin
PINP	Procollagen type I N-terminal Propeptide
BW	Body Weight
CTX-I	Type I Collagen C-telopeptide
BM	Bone Marrow
OC.N.	Osteoclast Number
ALP	Alkaline Phosphatase
n.s.	No Significant Difference
BV/TV	Bone Volume/Total Volume
N.A.	Not Available
BV	Bone Volume
Tb.Th.	Trabecular Thickness
Tb.N.	Trabecular No.
ROS	Reactive Oxygen Species
NF-κB	Nuclear Factor Kappa-light-chain-enhancer of activated B cells
IEC	Intestinal Epithelial Cell
ILC	Innate Lymphoid Cells
FXR	Farnesoid X Receptor
Mdr-2	Multidrug Resistance-2
GF	Germ Free
ConD-GF	Conventionalized Germ Free
IGF	Insulin-like Growth Factor
TJ	Tight Junction
SCFA	Short Chain Fatty Acid
TNBS	Trinitrobenzene Sulfonic Acid4
BFR	Bone Formation Rate
BS	Bone Surface
OS	Osteocyte Surface
Ct.Ar.	Cortical Bone Area
Ct.Th.	Cortical Thickness
Ct.Ar/Tt.Ar	Cortical Bone Fraction
DSS	Dextran Sulfate Sodium
Conn.D	Connective Density
Tb.Sp.	Trabecular Space
Tg	Transgenic
SpA	Spondyloarthritis
STAT	Signal Transducer and Activator of Transcription
PSC	Primary Sclerosing Cholangitis
OVX	Ovariectomy
CONV-R	Conventionally Raised
GIP	Glucose-dependent Insulinotropic Polypeptide
BMMSC	Bone Marrow Mesenchymal Stem Cells
ER	Endoplasmic Reticulum
GWAS	Genome-wide association studies
UPR	Unfolded Proteins
TUDCA	Tauroursodeoxycholic Acid