Melanoma is a lethal skin cancer. The early detection of melanoma using positron emission tomography (PET) probes is critical for improving the survival of melanoma patients. Melanin probe-2 is a non-radioactive bromo-picolinamide precursor that has been used for the synthesis of18F-picolinamides based PET probe (melanin probe-1). The tumor-targeting efficacy and imaging property of three melanin probes were evaluated in B16F10 tumor-bearing mice.18F-1 and18F-3 had much lower tumor uptake compared with18F-2 (Melanin probe-2), which were 12.74 ± 1.70, 16.61 ± 2.60, and 16.87 ± 1.23 %ID/g at 0.5, 1, and 2 h, respectively[1].