Figure 4

Comparison of the NAD⁺ levels of the facial nuclei and nerves from WT, CD38 KO and nicotinamide riboside (NR)-administered mice. (A,B) NAD⁺ contents of the facial nuclei (A) and nerves (B) in WT and CD38 KO mice. (C,D) NAD⁺ contents of the facial nuclei (C) and nerves (D) in mice with or without NR administration, NR(+) and NR(−), respectively. Data are expressed as mean ± SEM. n = 4, *p < 0.05, **p < 0.01, as determined by t-test.