The Preventive Effect of Theabrownin from Ya'an Tibetan Tea Against UVB-Induced Skin Photodamage in BALB/c Mice via the MAPK/NF-κB and Nrf2 Signaling Pathways.

Following TB pretreatment, there was a slight decrease in TNF-α levels ( Figure 4 A1), and a significant or highly significant reduction in IL-1β and IL-6 levels ( Figure 4 A2,A3).

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