melanotan 2 steroids II (“Tan Jabs”): Why They're Not Worth The Risk Melanotan II - Indications, Uses,
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Also, understanding the functional consequences of rewiring the metabolic program in the brain is of high importance

doi: 10.1007/s00210-010-0499-4

To overcome the selectivity issues of native lysine reactivity, researchers have developed genetic code expansion technologies to introduce non-natural lysine derivatives (such as lysine analogs bearing azide, alkyne, or tetrazine groups) at specific sites in proteins
The Lancet (British Edition), 398(10295), 143155