The occurrence of such a change in leukæmic cells has not been demonstrated. This communication describes the acquisition of resistance by a susceptible strain of Diplococcus pneumoniae as a result of ...

BECAUSE of the importance of purine analogues in the chemotherapy of human neoplastic disease 1, several investigations have been made on their mode of action and the mechanism of resistance 2 to them ...

2 WORCESTER, MASS. (From the Service of Dr. F. C. Shattuck and the Pathological Laboratory of the Massachusetts General Hospital.) ...