Table 3.

Kyn recovery in presence of culturing medium from cancer cells or cellular lysates used for IDO activity (accumulation time: 60 seconds).

Amount added [nM]	Amount found [nM] ± SD (n = 3)	Recovery [%]	Volume of the biological sample added (µL) a
Sample type: cellular lysate
20.00	22.56 ± 1.31	112.78	40
40.00	44.86 ± 3.29	112.14	40
Sample type: culturing medium
80.00	73.44 ± 5.71	91.80	10
600.00	554.41 ± 82.10	92.40	50

Abbreviation: SD, standard deviation.

^aVolume of the supporting electrolyte was 5 mL.