Figure 2.

The comparison of second derivative IR spectra extracted from UHCA analysis for lung parenchyma (averaged from n = 37 spectra) (A), bronchi ciliated cells (averaged from n = 23 spectra) (B), atelectasis (averaged from n = 43 spectra), (C) and fibrous/muscular tissue (averaged from n = 44 spectra) (D). Spectra are shown in the regions of 1700–1480 (1) and 1340–1000 cm⁻¹ (2). On week 5, bronchi ciliated cells were not found since atelectasis covers the entire area of the lungs.