Transfer RNA and transfer RNA modification in differentiation and neoplasia. Introduction.

i Letter to the Editor. 483 Controlling Factors in Urethan Carcinogenesis in Mice: Effect of Enzyme Inducers and Metabolic Inhibitors. Richard S. Yamamoto, John H. Weisburger, and Elizabeth K. Weisburger. 487 Isolation and Partial Characterization of a Glyceraldehyde 3-Phosphate Dehydrogenaseinactivating Factor from Ehrlich Ascites Tumor Cells. Francisco P. Marnarli and Saul Green. 491 Absence of an Effect of Partial Hepatectomy on Aflatoxin B! Carcinogenesis. Adrianne E. Rogers, Nora S. Kula, and Paul M. Newberne. 496 Effect of Immune Status on the Development of Artificially Induced Métastasesin Different Anatomical Locations. Jan Vaage, Kuang Chen, and Suzanne Merrick. 501 Effects of Some Fatty Acid Esters on the Viability and Transplantability of Ehrlich Ascites Tumor Cells. Akiko Kalo, Kunio Ando, Gakuzo Tamura, and Kei Arima. 505 Effect of Polyenic Antibiotics on Ehrlich Ascites and Novikoff Hepatoma Cells. Bruno Modovi, Roberto Strom, Alessandro Finazzi Agro, Paola Caiafa, Pasquale De Sole, Argante Bozzi, Giuseppe Roliìio,and Ales sandro Rossi Fanelli. 510 Some Properties of Substrains of L-Cells with a Decreased Sensitivity to Bis(2-chloroethyl) sulfide. /. G. Walker and B. D. Reid. 516 Oncogenic Response of Rat Skin, Lungs, and Bones to Vinyl Chloride. P. L. Viola, A. Bigotti, and A. Caputo. 523 In Vitro Test for Sensitivity of Leukemic Cells to L-Asparaginase. Robert Schrek and William C. Dolowy. 527 Glucose and Acetate Utilization by Hyperplastic, Alveolar Nodule Outgrowths and Adenocarcinomas of Mouse Mammary Gland. J. C. Bartley, Hope McGrath, and S. Abraham. Volume 31 / NumberS / May 1971