Table 1.

The α₁-antagonist prazosin (Pz) eliminates the stimulation of I_p by α₁-agonists

α-Agonist (A)	Ip(A)/Ip(con)	Ip(A+Pz)/Ip(con)	Ip(A2)/Ip(con)	Ip(recon)/Ip(con)
Phenylephrine, 100 μm	1.14 ± 0.04 (6)	1.01 ± 0.05 (6)	1.13 ± 0.05 (5)	1.02 ± 0.03 (5)
Methoxamine, 100 μm	1.13 ± 0.03 (17)	0.99 ± 0.04 (17)	1.14 ± 0.05 (8)	1.00 ± 0.03 (8)
Metaraminol, 100 μm	1.15 ± 0.05 (8)	1.00 ± 0.04 (8)	1.14 ± 0.07 (7)	1.02 ± 0.02 (7)

The protocol for Table 1 is shown in Fig. 8. All experiments were in 15 nm [Ca²⁺]_i. Numbers are means ±s.d. (number of cells).