According to source, "CT image of the lung of subjects with end-stage emphysema"
PLoS Medicine
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<a rel="nofollow" class="external free" href="http://medicine.plosjournals.org/perlserv?request=get-document&amp;doi=10.1371/journal.pmed.0010025">http://medicine.plosjournals.org/perlserv?request=get-document&amp;doi=10.1371/journal.pmed.0010025</a> (2004) T Cells Cause Lung Damage in Emphysema. PLoS Med 1(1): e25 doi:10.1371/journal.pmed.0010025