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Immunohistochemistry stained images for involucrin of 3D cell cultured sample for 3 days air exposure using culture media-treated CLLE concentrations of (a) 0 μg/mL, (b) 50 μg/mL, and (c) 250 μg/mL; for 5 days air exposure using culture media-treated CLLE concentrations of (d) 0 μg/mL, (e) 50 μg/mL, and (f) 250 μg/mL; and for 7 days air exposure using culture media-treated CLLE concentrations of (g) 0 μg/mL, (h) 50 μg/mL, and (i) 250 μg/mL.
