However, the levels of monocyte chemoattractant protein (Mcp1), a chemokine key to regulating monocyte/macrophage migration and infiltration [19], were significantly elevated in the LV of 100 cGy γ-IR mice compared to ND sham (p < 0.03), suggesting that γ-IR may promote cardiac inflammation (Figure 5C). Here, CCL2 is linked to inflammatory response.