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For instance, vitamin B12 is essential for the methionine cycle, a pathway closely linked to testosterone biosynthesis

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If the cause is absorption failure (pernicious anemia, gastric surgery), intramuscular B12 injections bypass the gut

NAD + is also involved in nucleotide and amino acid synthesis, such as the folate-dependent serine catabolism 347 , as well as genomic DNA replication, as reviewed above 118

Class B GPCRs, including receptors for GLP-1, glucagon, GIP, PTH, calcitonin, and secretin, share a distinctive two-domain architecture