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. 2008 Jul;47(4):25–34.

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Figure 3. — Effect of dim light (10 lx) or long nights (8:16-h light:dark) on heart rate responses (area under response curve; AURC) of male and female Sprague–Dawley (SD) and spontaneously hypertensive rats (SHR) after insertion of a conspecific intruder rat for 1 h (panel A) or removal of an established conspecific cagemate (panel B). *, Significantly (P < 0.05) different from value for 12:12-h light:dark, 200 lx; ^#, SHR significantly (P < 0.05) different from SD; ⁺, females significantly (P < 0.05) different from males. Each group contained 6 rats.