In contrast, in both unstimulated and stimulated naïve B cells from IPF patients, this correlation between BCR signalosome phosphorylation and ex vivo BAFFR surface levels was not found but had apparently shifted towards TACI surface expression (Figure 2D,F; pPLCγ2 used as an example). This evidence concerns the gene TNFRSF13B and idiopathic pulmonary fibrosis.