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B12 is also involved in cellular metabolic processes such as DNA synthesis and regulation, synthesis of fatty acids and energy production

Antibiotics 11 , 200 (2022)
Kollagensynthese Der zellulre Prozess zur Herstellung von Kollagen
The sections were air-dried overnight at 37C, followed by deparaffinization, hydration, antigen retrieval and endogenous peroxidase removal

When intrinsic factor is absent or insufficient, the body cannot absorb vitamin B12 effectively, even if intake from food or supplements is adequate
in Brenner and Rectors The Kidney 11th edn (2019)