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Description
Melanotan 2 is a synthetic peptide that mimics alpha-melanocyte-stimulating hormone (-MSH), a naturally occurring substance secreted from the pituitary gland [1]
Whether that reflects something real about the compound perhaps it works better for certain tissue types or injury mechanisms or whether it is just noise in a sample size of one, I genuinely cannot tell you

2 The affected peptides aren't permanently confined to Category 2

Nusse, Wnt signaling in skin development, homeostasis, and disease
