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metabolite Ac-LKKTE identified as potentially more active than parent compound Paradoxical finding: Both peptides show biological effects persisting hours to days after administration despite rapid plasma clearance Possible explanations: Tissue retention, active metabolites, or persistent signaling cascade activation Excretion Pathways Limited data exists on excretion for both peptides[22]: Likely renal elimination of peptide fragments Hepatic metabolism may contribute to clearance No accumulation detected in chronic dosing studies (animal models) Combined excretion kinetics have not been characterized in any species The disconnect between short plasma half-lives and prolonged biological effects represents a key area requiring mechanistic clarification for both individual peptides and their combination

Poor bioavailability is more likely when the compounds violate two or more of the RO5

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To understand the comparison, you must look at their origins and cellular targets

FAK-paxillin activation for fibroblast migration Growth hormone receptor upregulation on tendons VEGFR2-Akt-eNOS pathway for blood vessel formation Nitric oxide modulation reducing inflammation Erg-1 transcription factor inhibition Angiogenesis, the formation of new blood vessels, represents another critical mechanism