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HPA axis studies measure serum cortisol, ACTH, and CRH levels via radioimmunoassay or ELISA following DSIP administration in stress-challenged animal models

The basics that underlie all peptides, endogenous and exogenous alike, are these: Peptides are strings of amino acids

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B12 injections carry a range of potential side effects from mild injection-site reactions to rare but serious allergic responses