NFKB1 and mucositis: Induction of mucositis increased the expression of NF‐κB as well as IL‐β and TNF‐α as evident in immunohistochemical analysis (Figure 5), which is in accordance with the previous knowledge (Al Asmari et al., 2016; Hassan et al., 2010; Lessa et al., 2021; Zhang et al., 2019).