CD44 and pulmonary fibrosis: These genes were identified in reports of the alternative splicing in pulmonary fibrosis of known etiologies CD44 [31], RXFP1 [32], and CD146 [33], a pulmonary fibrosis mouse model (FGFR2) [26], and a genetic link between COVID-19 and IPF (DP99 and ATP11A) [34,35].