here we show that efflux of two specific poly ( a ) -rich mrnas ( actin and beta-tubulin ) from isolated l-cell nuclei is almost totally dependent on the presence of atp , while efflux of poly ( a ) -free histone mrna ( h4 , h2b , and h1 ) also occurs to a marked extent in the absence of this nucleotide .
C0007610
nuclei
C0086411
h2b