Table 1.

pD₂ values of nucleotides inducing endothelium-dependent relaxations in phenylephrine precontracted segments of the thoracic aorta and the aortic root

	Thoracic aorta	Aortic root
	−log (M)	−log (M)	P-valuea
ATP	5.40±0.01	5.52±0.07	0.1281
ATPγS	5.82±0.02	6.12±0.08	0.0066
ADP	6.22±0.07	6.56±0.12	0.0401
UTP	6.24±0.02	6.91±0.09	<0.0001
UDP	6.31±0.02	6.69±0.05	0.0001

Values represent mean±s.e.m. of five mice (ATPγS, n=3).

^aAortic root versus thoracic aorta (Student's t-test).