And a very speedy response countering Chromadex's Dr. Brenner:
"We appreciate the authors’ insightful comments and the opportunity to clarify the important issues related to our recent publication2. However, their claim of ‘absence of evidence’ has no concrete foundation and the data in our article strongly support our conclusion that Slc12a8 is an NMN transporter, although there are still many interesting questions regarding the structure and function of Slc12a8 as an NMN transporter."
https://www.nature.c...DUOdTkcoS9pdnYo