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Behav Brain Res 217(1):4754

Gray-market peptides can create risks beyond the peptide itself, raising concerns over product quality, purity, and inconsistent formulation

Endogenous Opioid System The endogenous opioid system is a highly diverse peptide neurotransmitter system comprising opioid receptors and three major neuropeptide families containing multiple member peptides

In general, a further comparative analysis of the structure of short peptides with functional domains of regulatory molecules (transcription factors, DNA/RNA-binding proteins, ncRNA) will allow us to reveal the key effector links of peptide regulation of gene expression