*3.3. Radiochemistry*

Radiolabelling with Gallium-68 was performed by mixing 500 µL [68Ga]gallium chloride ([68Ga]GaCl3) eluate, obtained by fractioned elution of a <sup>68</sup>Ge/ <sup>68</sup>Ga-generator (IGG100, nominal activity 1850 MBq, Eckert and Ziegler, Berlin, Germany) with 0.1 M hydrochloric acid (HCl, Rotem Industries Ltd., Beer-Sheva, Israel), with 100 µL sodium acetate solution (1.14 M) to give a final pH of 4.5 and adding 10 µg (3.71-5.31 nmol) of the corresponding fluorescent FSC-Tz derivative. After incubation for 5 min at ambient temperature radio-RP-HPLC- as well as radio-ITLC-analysis was performed.
