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Cellular internalization (A, C) and efflux (B, D) of 203Pb-DOTA-GGNle-CycMSHhex on B16/F1 (A, B) and B16/F10 (C, D) melanoma cells. Total bound radioactivity (♦), internalized radioactivity (■) and cell membrane radioactivity (▲) are presented as counts per minute (cpm).
