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The engagement of the PD-1 receptor with PD-L1 activates PD-1 downstream from Src homology region 2 domain-containing protein tyrosine phosphatase (SHP-2) and dephosphorylates ZAP70, leading to the inhibition of T cell survival, proliferation and cytokine production, inducing T-cell exhaustion

When the body doesnt have any means to absorb vitamin B12 from food, an injection is the most direct solution

Neo-B12 Injection contains the active ingredient hydroxocobalamin chloride (equivalent to hydroxocobalamin anhydrous 1000 micrograms), used to treat conditions due to vitamin B12 deficiency

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A 10 mg vial reconstituted with 2 mL of bacteriostatic water yields 5 mg/mL