MC1R and metastatic melanoma: Another MC1R targeting peptide, [203Pb]Pb-DOTA-GGNle-CycMSHhex demonstrated a favorable accumulation and good imaging properties in both immunocompetent subcutaneous B16/F1 and B16/F10 mouse models, as well as in a B16/F10 pulmonary metastatic melanoma mouse model 116​.