A). Q-PCR analysis of APRIL, BAFF and TSLP expression in proximal small intestinal epithelial cells of WT and V-TLR4 mice (n=3/group; **, p<0.01). B). Western blot of APRIL protein in proximal small intestinal epithelial cells of WT and V-TLR4 mice. C & D). Immunostaining of APRIL in duodenum of WT (C) and V-TLR4 (D) mice (red, APRIL; blue, DAPI). E). FACS analysis of IgM+/IgA+ cells in lamina propria of proximal small intestine of WT and V-TLR4 mice (WT n=3, V-TLR4 n=4; * p< 0.05). F). RT-PCR analysis of post switch circular transcript (α-CT) expression in lamina propria B cells from WT and V-TLR4 mice. Data represented pooled B cells from 20 WT or 10 V-TLR4 mice. Different bands represent different splice variants of α-CT as previously described 24.