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. 2002 Dec 15;22(24):10985–10995. doi: 10.1523/JNEUROSCI.22-24-10985.2002

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Fig. 4. — Plasma level of estrogen in Sham (diestrus) and OVX rats during behavioral testing (periods 1–7). The gray bar indicates the level of estrogen 1 hr after injection of 10 μg of 17β-estradiol (OVX₂ group, open triangles). The plasma estrogen concentration tested 5 d after implantation of pellets with 17β-estradiol was similar in both OVX₁ (period 6, open squares) and OVX₂ (period 7) groups. The level of estrogen slightly decreased when tested 1 month after implantation (OVX₁group, period 7). Filled circles, Sham.