tokens: To evaluate T helper-cell phenotype in fatty streak formation , wild-type C57Bl/6 mice ( IA ( b ) +IE- ) and transgenic mice , either AB ( o ) , IA ( b ) -IE- ; ABEalpha , IA-IE ( k ) + ; or BL : TG : Ealpha , IA ( b ) +IE ( k ) + , were fed a high-cholesterol diet for 16 weeks and evaluated histomorphometrically for aortic lesions .