LYN and glomerulonephritis: Consistent with this, mice deficient in Lyn and p110δ, a PI3K isoform, also show a reduction in inflammation, splenomegaly, T cell activation, ANA production, and glomerulonephritis, while hyper-phosphorylation of Akt and Erk1/2 compared to control mice after BCR cross-linking remained (132), indicating a unique requirement for Lyn in regulating these signaling responses, but one that is insufficient by itself to permit development of disease.