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Aerosol characterisation. Number-weighted mobility equivalent particle size distributions averaged over the entire exposure duration for each aerosol exposure group (A). Error bars are not shown for clarity. Representative TEM images of the aerosol particles (B) delivered to the Fe3O4 high-dose (a,b) and FeOx-mix high-dose (c,d) exposure groups. The scale bars are as follows: (a) 50 nm; (c) 100 nm; (b) and (d) 5 nm.
