CD44 and interstitial lung disease: For instance, comparing the percentage of positive population after liposome treatment, only in the case of PEG-LIP-HA400kDa, we obtained a significant increased internalization in CLAD- and CTD-ILD-derived LFs (CD44 positive) compared to 16HBE (Figure S1e), in contrast to PEG-LIP (Figure S1d).