SMARCA4 and idiopathic pulmonary fibrosis: Of potential relevance to the current study identifying CD44/Brg1 nuclear complex in regulating IPF MPC self-renewal, several RNA splicing factors (e.g., SRSF6 & SRSF3) which have been identified as target genes for Brg1 are included in the list of top 20 genes correlated with CD44 expression.