Table 2.

Stability of the enzyme tracer.

Storage days	IC50 ± SD (ng mL−1, n = 3)			IC15 ± SD (ng mL−1, n = 3)
	4°C	Room temperature	37°C	4°C	Room temperature	37°C
1	0.61 ± 0.035	0.54 ± 0.039	0.53 ± 0.042	0.06 ± 0.004	0.05 ± 0.005	0.05 ± 0.005
3	0.42 ± 0.037	0.47 ± 0.035	0.44 ± 0.044	0.04 ± 0.005	0.04 ± 0.006	0.04 ± 0.005
5	0.61 ± 0.036	0.58 ± 0.032	0.83 ± 0.046	0.06 ± 0.004	0.07 ± 0.004	0.08 ± 0.006
7	0.66 ± 0.038	0.53 ± 0.041	0.90 ± 0.052	0.07 ± 0.005	0.06 ± 0.006	0.10 ± 0.007