we injected rat pups with hydrocortisone sodium succinate , 1-thyroxine pentahydrate , sodium salt , sodium phenobarbital , or the control solution on days 4 , 6 , 8 , or 10 of life ( phenobarbital , days 3 , 5 , 7 , or 9 ) .
C0282303
sodium phenobarbital
C0031412
phenobarbital