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(a) Dose–response relationship between Ang II concentrations and spontaneous beating rate. A plateau was observed after 0.1 μM. (b) Dose–response relationship of immunoglobulin fractions from two preeclamptic women (each measured 10 times) on the spontaneous beating rate. Dilutions from 1:20 to 1:400 were prepared. A linear response from 1:400 to 1:40 was observed, after which a maximum effect was observed. Ang II, angiotensin II.
