Figure 2.

Release of free ¹³¹I into the supernatant of cell culture medium at various times after incubation with 1‐[¹³¹I] (♦) or 2‐[¹³¹I] (□), in the absence (dashed lines) or presence (solid lines) of MCF‐7 breast cancer cells. Percentages were determined by HPLC peak integrals.