levels in Soat1−/− mice, we backcrossed sterol O-acyltransferase 1 (Soat1)−/− mice,
originally reported to have elevated HDL levels, to C57BL/6 mice and constructed a
congenic strain with only a small region (3.3 Mb) of 129 alleles, specifically excluding the
nearby apolipoprotein A-II (Apoa2) gene from 129. HDL levels in these Soat1−/− mice were
no different from C57BL/6, indicating that the passenger gene Apoa2 caused the previously …