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For more on how peptide structural modifications produce different half-lives, see Peptide Half-Life Explained: Why Some Peptides Last Hours and Others Days
There is After having a B12 shot, a person should monitor for adverse symptoms and seek medical help if they experience: severe pain at the injection site mild diarrhea a swelling sensation in the body temporary itching of the skin In rare cases, a person may also be at risk of: anaphylaxis pulmonary edema congestive heart failure peripheral vascular thrombosis, which involves blood clots polycythemia vera, which is a type of blood cancer If anyone experiences difficulty breathing, hives, or swelling, they need emergency medical help
that is, the gene encoding the folate-metabolizing enzyme methylenetetrahydrofolate reductase (MTHFR)
Multiple observational studies (see this and this
The exact concentration depends on the cell type and the research question
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