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5,6 Furthermore, measurements of metabolites such as methylmalonic acid and homocysteine have been shown to be more sensitive in the diagnosis of vitamin B 12 deficiency than measurement of serum B 12 levels alone

Male SpragueDawley (SD) rats weighing 200 20 g were obtained from the Animal Experiment Center of the Fourth Military Medical University (Xian, China) and housed in a specific pathogen-free animal facility

i-NOS, inducible nitric oxide synthase

When applied to the skin or injected, each of these peptides sends signals to cells, encouraging the production of collagen and other essential proteins