Figure 1. Administration of the niacin antagonist (6-AN) enhanced UVB-induced ear skin swelling.

(A) Ear swelling responses were monitored and the increase in ear thickness was calculated. Data are presented as means ± SEM. *, P < 0.05. (B) Clinical photographs. (C) H&E staining of the skin after UVB exposure. Original magnification, x200. Scale bar 100 μm. (D) The histological samples were scored. Data are presented as means ± SEM.*, P < 0.05.