Table 1.

EC₅₀ values for noradrenaline-induced contractions

Conditions	EC50, μM
	Rabbit anococcygeus muscle	Human corpus cavernosum	Rat anococcygeus muscle
Control	1.8  ± 0.3	56.1  ± 6.2	19.4  ± 1.9
During EFS	>300*	>300*	20.8  ± 1.2
During EFS +l-NOARG	1.7  ± 0.3	48.3  ± 2.7	19.6  ± 1.0

EC₅₀ values for noradrenaline-induced contractions under control conditions, during EFS, and during EFS after l-NOARG (300 μM) treatment in tissues treated with guanethidine (10 μM). 

^*P < 0.001 vs. control value; n = 4 for each. Where values are >300 μM, the EC₅₀ was considered to be 300 μM for statistical comparison.