Correction: Cerebral artery alpha-1 AR subtypes: high altitude long-term acclimatization responses.

Fig. 4C incorrectly appears as a duplicate of Fig. 2C. The authors have provided a complete, correct version of Fig. 4 here.

Fig 4

PHE responses in presence and absence of α1B-AR subtype antagonist (10−5 M CEC) in normoxic and LTH ovine MCA.

(A) Dose-response curves in normoxic MCA. Vascular tensions (g) for MCA in response to PHE alone (•, solid line), and in the presence of 10−5 M CEC (Δ, dashed line). (B) Dose-response curves in LTH MCA. (C) Tension (g) at EC50 in normoxic sheep MCA. (D) Tension (g) at EC50 in LTH sheep MCA. n = 5 sheep in each group. Values are means ± standard error of means. *Denotes P = <0.05.