Table 1.

Labelling results of conjugates with Eu³⁺and¹¹¹In³⁺

Incubation method	111In3+labelling in %	Eu3+labelling in %
2.4-fold excess of linker 4	46.2	36.7
8-fold excess of linker 4	53.1	36.2
24-fold excess of linker 4	58.6	41.7
for comparison:
cys-anxA5 5	0.0	0.0

In case of europium the yield was determined by measuring the fluorescence, in case of ¹¹¹In³⁺ by radioactivity measurement. The numbers are percentages of labelled protein.