CASP	colon ascendens stent peritonitis
CFSE	carboxyfluorescein-succinimidyl-ester
DAPI	4′,6-diamidino-2-phenylindole
FACS	fluorescence-activated cell sorting
i.p.	intraperitoneal
IRA B cell	innate response activator B cell
LPS	lipopolysaccharide
PALS	periarteriolar lymphoid sheaths
PerC	peritoneal cavity
PMA	phorbol-12-myristat-13-acetat
PP	Peyer’s patch
RT-PCR	real-time polymerase chain reaction
SED	subepithelial dome
SEM	standard error of mean
SLO	secondary lymphoid organs
S1P	sphingosine-1-phosphate
S1PR	S1P receptor
s1pr4−/−	mouse homozygous deficient in S1P4
TLR	toll-like receptor
wt	wild-type (C57BL/6J) mouse