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A series of recombinant inbred strains called BXD [produced from a cross between C57BL/6J (B6) and DBA/2J (D2)] were given single i.p. doses of 0.6 mg/kg 2,3,7, 8-tetrachlorodibenzofuran (TCDBF) on day 12 of gestation. The uteri were examined in late gestation with respect to resorptions and fetal death, and fetal malformations. The strains of the B6-type with respect to Ah-locus (Nos. 5, 6, 8, 11, 12, 14, 16 and 29) that are Ah-responsive, exhibited cleft palates in 80-100% of all fetuses, while hydronephrosis occurred at a rate of 20-70%. These two types of malformation are well recognized from earlier experiments with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and its structural analogues, including TCDBF. In the strains of D2-type with respect to Ah-locus (Nos. 2, 15, 19, 21, 22, 24, and 31), which are Ah-nonresponsive, no cleft palates occurred. One strain (No. 2) had a few (17%) fetuses with hydronephrosis. The frequency of fetal deaths and resorptions were relatively low, but slightly higher among B6-strains than D2-strains. The results indicate an association between the genes producing malformations by TCDBF and the Ah-locus.
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