Intramuscular (IM) administration of B12 allows for direct delivery, bypassing the digestive system and ensuring efficient absorption, particularly in individuals with malabsorption or gastrointestinal issues
While this dose is considerably higher than typical environmental residues (found in the range of micrograms per kilogram), it is intentionally used in high-dose toxicological models to elucidate mechanisms of toxicity and assess mitigation strategies under controlled conditions 41
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As expected, the strictly conserved Asn419 hTrxR1 appears to be the most important residue for aligning the flexible C-terminal arm during catalysis, because a simultaneous mutation of all three guiding bar residues (Trp407 hTrxR1 , Asn418 hTrxR1 , and Asn419 hTrxR1 ) led only to a minor increase in hTrx1- and DTNB-reduction activity of hTrxR1 compared to the mutation of Asn419 hTrxR1 alone (Table 2)
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