Fig. 2

TEM dark-field images of cross-sectional views from AFBs of each patient. Two AFBs were selected from each patient; the patient and AFB number are indicated in the top left-hand corner of each panel. The white or black lines indicate the transects along which the EDS data was taken. Note that the wavy white discolouration on the surface of the AFBs is from the copper biofilm that was used to fix the AFBs in place. N1 and N2 are non-smoking patient 1 and 2 and S1 and S2 are smoking patient 1 and 2, respectively