Double immunostainings for DDR1 (A, D, and G) with F4/80 (B, merge in C), Mac1 (E, merge in F), and dendritic cell marker MCA948 (H, merge in I) in renal cortex 12 days after UUO. Merge shows partial overlapping, consistent with the predominant expression of DDR1 by a subset of the macrophages recruited in the interstitium of the obstructed kidney (A–C, ×20; D–I, ×40).