( 2 ) a trophic activity which did not bind to polylysine-treated wells , which was greater than 10,000 da in size , heat labile , and sensitive to trypsin , and which , in the presence of polylysine-bindable material , facilitated the survival and growth of entorhinal cells in culture , and ( 3 ) an inhibitory activity which significantly reduced survival in entorhinal cultures when cells were plated in the presence of high concentrations of extract prepared from normal brain .
C0007595
growth of
C0007634
cells