Erythrocyte Suspensions NO nM GSNO μM Control 1.16 ± 0.34 6.3 ± 1.6 ACh 10 μM 2.04 ± 0.41 7.4 ± 1.6 Timolol 10 μM 1.48 ± 0.45 1.8 ± 1.0

Table 1: Mean ± sd values of NO and GSNO concentration obtained in untreated (Control) and treated blood samples with acetylcholine (ACh) 10 μM and timolol 10 μM.