Vitamin A (retinol)
ADH1ADH4ADH5
Retinal
APC
ALDH1a1
ALDH1a2
Th-17 cellsHigh dose
Mucosal homing T cells
CCR9+
α4β7+
Retinoic acid (RA)
RAR/RXR
Naı̈ve T cells
CCR9−
α4β7−
TGF-β/IL-10
IL-5IL-6
CCR9+
α4β7+
IgA+
FoxP3+Tregs
CCR9+
α4β7+
B cell
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