Indeed, IgA in serum has recently been proposed as a prognostic biomarker for IPF.44 While space limitations preclude our discussing every disease community in detail, given the high cohesiveness of multiplex disease communities, readers can draw similar possibly interesting disease-disease interactions from any of the communities using Supplementary Table 1 as reference. The gene discussed is CD79A; the disease is idiopathic pulmonary fibrosis.