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In view of this, various strategies to improve peptide stability have been presented, including modifications of the C/N-terminus [34] and D -amino acid substitution [35]

Medicare coverage depends on documented hypogonadism diagnoses supported by testosterone serum levels below 300 ng/dL, while commercial payers impose additional utilisation management protocols including step therapy and quantity limits

Apart from trafficking in complex with various neurotransmitters, carrier peptides and proteins, or as part of the protein cargo of extracellular vesicles [39] there is also the potential for copper uptake as a result of autophagy [29, 249]