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The lymphoid tissues show marked regional differas 10 ug/ml (7), CdR3H was injected in a single ences in the pattern of incorporation of tritiated dose of as much as 400 μCi/mouse (or in a concenthymidine (TdR-3H) by lymphocytes (1-5) . tration of about 13 μg/ml if the total volume of free Thymic lymphocytes and germinal-center cells of water is assumed to be 15 ml /mouse) . Corresponding lymph nodes are characterized by weak labeling to such a high dose of CdRH, TdRH was given ith TdR 3H, whereas the large majority of in a single dose of 200 μCi/mouse . The dose of unw labeled CdR given together with TdRH was 0 .5 lymphocytes in lymph nodes which occur outside mg/mouse . This dose is about 50 times as great as of germinal centers are intensely labeled with that of TdR 3H . TdR3H radioautographically . The reasons for the Animals were sacrificed 24 hr after the injection, observed differences in labeling intensity between and smears were made from the thymus and mesenthe two types of lymphocytes are not apparent . teric lymph nodes, so that each slide had two smears, However, it seems probable that they might be one from the former and the other from the latter . related to the differences in the pathways of formaAfter fixing in Carnoy's fluid for 8 min, smeared tion of DNA-thymine . Sugino et al . (6) have samples were prepared for radioautography, using demonstrated by chemical methods that, in the NR-M3 dipping film (Konishi-roku Shashin-kogyo Co., Tokyo, Japan), and were exposed for 14 days thymus, deoxycytidine (CdR) which is circulating at 4 °C. For examination of radioautograms, at least in a considerable amount (7) is utilized for the 1000 lymphocytes were counted in each smear and formation of DNA-thymine . In this study, we have the mean number of grains of all labeled cells (mean attempted to gain further information on the grain count), the percentage of cells labeled, and the above-noted utilization of CdR by lymphocytes number of grains per 100 cells (mean grain count X by means of radioautographic techniques . percentage of cells labeled) were determined . Cells with less than three grains were not counted as MATERIAL AND METHODS labeled .

A RADIOAUTOGRAPHIC STUDY OF THE UTILIZATION OF DEOXYCYTIDINE FOR THE FORMATION OF DEOXYRIBONUCLEIC ACID-THYMINE IN LYMPHOCYTES