MC1R and melanoma: Looking into MC1R TRT peptides, Qiao et al. explored the potential of 67Cu-NOTA-PEG2Nle-CycMSHhex in B16/F10 melanoma bearing C57 mice which displayed favorable biodistribution properties including high tumor uptake (24.10±1.83%ID/g) at 2 h p.i[92].