Specific activity of ²¹¹At-antibodies is 9.25 × 10¹³ Bq mol⁻¹ for A, 9.25 × 10¹⁴ Bq mol⁻¹ for B, and 9.25 × 10¹⁵ Bq mol⁻¹ for C in experiment 2 and 1.25 × 10¹⁶ Bq mol⁻¹ in experiment 1. Specific activity of ²¹³Bi-antibodies is 1.16 × 10¹⁶ Bq mol⁻¹ for A, 1.16 × 10¹⁷ Bq mol⁻¹ for B, and 1.56 × 10¹⁷ Bq mol⁻¹ for C. Specific activity of ²²⁵Ac-antibodies is 8.14 × 10¹² Bq mol⁻¹ for A, 8.14 × 10¹³ Bq mol⁻¹ for B, and 1.14 × 10¹⁴ Bq mol⁻¹ for C. Ratio > 1 implies cocktail is more lethal than single antibody. Ratios are average of 2 experiments. SEs are noted. Ab2 alone contains Ab2 (3 μg mL⁻¹), cocktail contains Ab2 (1 μg mL⁻¹), Ab3 (1 μg mL⁻¹), and Ab4 (1 μg mL⁻¹). Specific activity in column B is cited in literature for given radionuclide (4,21,22). Column A is 10-fold reduction of that specific activity, and column C is specific activity required to result in about 10 survivors of analyzed population of 300,000 cells.