P2RX4 and idiopathic pulmonary fibrosis: Nevertheless, the Idiopathic Pulmonary Fibrosis (IPF) Cell Atlas is an online resource which provides visual outputs of gene expression data at the single cell level from both normal and IPF lung tissue (available from https://p2med.shinyapps.io/IPFCellAtlas/), and can therefore be used to give an indication of purinergic receptor expression at the single cell level in healthy and diseased lung tissue.