Thus, so far, we could not answer the question of whether the bone marrow is the source of lung Sca1+ or α7nAChR+Sca1+ cells during lung injury repair; however, the findings that transplantation of α7nAChR+Sca1+ cell-enriched BM-MNCs to recipient pneumonia lungs improved lung injury and increased engraftment indicate that α7nAChR+Sca1+ cells might migrate into the lung for reparative processes. This evidence concerns the gene CHRNA7 and susceptibility to pneumonia measurement.