CCR10 and idiopathic pulmonary fibrosis: Immunohistochemical (IHC) analysis showed that CCR10+ interstitial cells were rarely observed in normal lung explants (Figure 1, C and D) but were most abundant in rapid-IPF lung biopsies (Figure 1, G and H) compared with slow-IPF lung biopsies and IPF lung explants (mainly from slow-IPF patients) (Figure 1, E, F I, and J, respectively).