Blood clearance of 2L-Rap-hLL1-γ4P in naive SCID mice. Naive SCID mice were coinjected intravenously with ⁸⁸Y-DTPA-hLL1 (○) and ¹¹¹In-DTPA-2L-Rap-hLL1-γ4P (□). At selected times after dosing, mice were bled by cardiac puncture and a blood sample was counted for radioactivity. Data represent mean ± SD of injected dose in blood (n = 3).