The incorporation of radioactive phosphorus into the nucleic acids of different rabbit tissues

In a previous paper (Smellie, McIndoe, Logan, Davidson & Dawson, 1953) we have discussed the incorporation of radioactive phosphorus (82p) into the deoxyribonucleic acid (DNA) of the cell nucleus of rabbit liver and into the ribonucleic acid of the nucleus (nRNA) and of the various cytoplasmic fractions (cRNA) at different times after administration of the isotope. As might be expected in a non-proliferating tissue, the incorporation into the DNA was only slight. On the other hand, the incorporation into the cRNA was relatively great and at a maximum at about D0 hr. after administra-