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E A+B is the observed effect of the combined drugs, and E A *E B the expected effect when the drug effects are independent (viability values of the two single drugs)

Once the appropriate treatment is determined, a healthcare professional will insert a sterile needle into a vein, usually in the arm, and connect it to an IV bag containing the prescribed solution

However, certain medications and substances may still interact with methylcobalamin, potentially altering its absorption or effectiveness

In newborn screenings where biochemical markers are indicative of vitamin B 12 deficiency, the diagnosis of inborn errors of vitamin B 12 metabolism is performed via functional studies on cultured fibroblasts isolated from skin biopsies (Watkins and Rosenblatt, 2013) or via molecular genetic analysis of putative genes