CD68 and COVID-19: However, consistent and diffuse expression of pSTAT3 was shared in COVID-19 samples by numerous cell types; among them, several CD68+FLIP+ alveolar macrophages (Fig. 1A, third and fourth lines), histiocytic cells (Fig. 1A, fifth and sixth lines), and monocytes/interstitial macrophages (Supplementary information, Fig. S1B).