CCL3 and pemphigus foliaceus: By day 21 after BLM injection, protein levels in CCR7-/- lungs were comparable or lower than those measured in the WT lungs, with the exception of interleukin (IL)-12 and macrophage inflammatory protein (MIP)1α, which are slightly increased in CCR7-/- lung homogenates compared with WT lungs and have been implicated in BLM-induced PF.