CCR2 and ocular melanoma: Flow cytometric analysis for proinflammatory classical monocytes (LY6C1hi CCR2+cells) and nonclassical monocytes (LY6C1low CCR2−cells) revealed that the ratio of proinflammatory monocytes to nonclassical monocytes in the lung increased after BLM-induced lung injury compared with control mice, while the opposite results appeared following OM-MSCs transplant, suggesting OM-MSCs were able to alter the proportion of monocytes infiltrated in the lung to alleviate inflammation and fibrosis (Fig. 4).