and mouse with congenital primary hypothyroidism in which the thyroidal gland shows hypoplasia , thyroxine ( t4 ) in blood is not measurable and , conversely , tsh level is abnormally high ( hyt ) , the males of dw/dw and hyt/hyt have been proved to be infertile , but it is little known about lit/lit .
C0010308
congenital
C0040132
thyroidal gland