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Fig. 4. The mean baroreflex responses at 60% (diamonds), 70% (squares), 80% (circles) and 90% (triangles) of development. Notice that decreases in blood pressure (a) with sodium nitroprusside (SNP) did not induce reciprocal changes in heart rate (fH). Data are means ± S.E.M. (N=8). Asterisks indicate a significant heart rate response (P<0.05).