previously we reported [ packer , l. & smith , j.r. ( 1974 ) proc . natl . acad . sci . usa 71 , 4763-4767 ] that the lifespan of wi-38 human diploid fibroblasts in vitro was significantly increased by continuously growing the cell cultures in the presence of vitamin e ( dl-alpha-tocopherol ) , but in 19 subsequent subcultivation series we were unable to reproduce these findings .
C0041703
usa
C0043193
wi