Table 3. IC₅₀ Values of Receptors 4, 5, 8, 9, and 10 Obtained from MTT Assays on GLC4, HN4 and CAL27 Cell Lines at 24 h Exposure Time^a.

receptors	GLC4	CAL27	HN4
4	7.18 ± 0.91	25.77 ± 8.31	27.63 ± 3.35
5	5.12 ± 0.98	10.93 ± 1.88	14.73 ± 0.81
8	2.43 ± 0.14	12.16 ± 1.61	11.04 ± 0.04
9	2.70 ± 0.04	10.98 ± 0.80	8.71 ± 0.79
10	3.05 ± 0.06	10.76 ± 0.82	9.05 ± 0.52

^aResults represent a mean of three independent experiments with standard deviation and are in μM.