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. 2019 May 31;10:1187. doi: 10.3389/fimmu.2019.01187

Figure 2.

Figure 2

CD38 is primarily an NAD+ glycohydrolase, which degrades nicotinamide nucleotides. In addition to the NAD+ glycohydrolase activity, CD38 exhibits inefficient ADP-ribosyl cyclase activity and mediates a base-exchange of vitamin B3 bases in the presence of excess nicotinamide analogs.