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10.1038/nrc779 Nat

Vitamin B12 deficiency may occur in between 40% to 80% of the vegetarian population who are not also consuming a vitamin B12 supplement.In Hong Kong and India, vitamin B12 deficiency has been found in roughly 80% of the vegan population as well

35 The evolutionarily conserved, ~90-residue-long PDZ sequence allows the scaffolding proteins to perform two major functions: 1) anchoring the intracellular C-terminus of transmembrane proteins (TJs, ion channels, receptors, etc.) and 2) establishing scaffolding networks via interactions with other PDZ proteins through PDZPDZ dimerization

Cureus 17(10): e94838

Thus, Nestin is used as a marker of progenitor cells in the CNS