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. 2018 Jun 5;19:111. doi: 10.1186/s12931-018-0806-z

Fig. 5.

Fig. 5

Effects of PTL on histopathological change in vivo. a Gross appearance of the lungs under the stereoscopic microscope. b, d Photomicrographs of lung sections stained with hematoxylin–eosin (HE). c, e Masson trichrome staining of collagen on lung sections. (*P < 0.05, **P < 0.01)