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Adult and fetal CA tension and [Ca2+]i responses to Phe under control conditions and in the presence of α1B-AR inhibition by chlorethylclonidine (CEC). A and C: vascular tensions (g) for fetal (A) and adult (C) CA in response to Phe alone and in the presence of 10−5 M CEC (n = 4 each). B and D: fluorescence ratio (F340/380) for fetal (B) and adult (D) in response to Phe alone or after 10−5 M CEC.
