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Data are means ± SE. Body mass in grams. ER, estrogen receptor; WT, wild type; KO, knockout; Arom, aromatase (Ar). Sample sizes were as follows: ERαWT, n = 13; ERαKO, n = 17; ERβWT, n = 10; ERβKO, n = 11; ArWT, n = 8; ArKO n = 12. *P < 0.05.