1713 Immunoepidemiological and in Vitro Studies of Possible Relationships between Australia Anti gen and Hepatocellular Carcinoma. J. A. Smith and T. I. Francis. 1721 Deamination of Arabinosyladenine by Adeno sine Dearninase and Inhibition by Arabinosyl 6-mercaptopurine. David Li-Shan Chao and A . P. Kimball. 1725 Inhibition of Tumorigenesis in Mouse Skin by Leupeptin, a Protease Inhibitor from Actino mycetes. Motoo Hozumi, Masako Ogawa, Takashi Sugi mura, T6mio Takeuchi, and Hamao Umezawa. 1729 Early Replication of Herpesvirusesin Naturally Occurring Frog Tumors. Robert Gilmore McKinnell, Virginia L. Ellis, David C. Dapkus, and Lyle M. Steven, Jr. 1734 Studies on Adrenocortical Carcinoma of Rat Cyclic Nucleotide Phosphodiesterase Activities. Rameshwar K. Sharma. 1737 Association of Exogenous RNA with Novikoff Hepatoma Ascites Cells. Shoji Okada and Harris Busch. 1745 A Surface 3'-Exonuclease of Novikoff Hepa toma Ascites Cells. Stanley T. Crooke, Shoji Okada, and Harris Busch. 1753 Aspartyl Transfer RNA Profiles in Normal and Cancer Cells. William T. Briscoe, William Taylor, A . Clark Grtffin, Ronald Duff, and Fred Rapp. 1756 Serum Lipoprotein Levels in Patientswith Can cer. Urs E. Nydegger and RenÃ©E. Butler. 1761 Metabolic Activities of Murine Carcinoma 755 at Various Stages of Growth. Glynn P. Wheeler and Jo Ann Alexander. 1769 An Amelanotic Variant of B16 Malignant Mel anoma. Linda M. Pasztor and Funan Hu. 1775 Comparative HighResolution Electrophoresis of Tumor Histones: Variation in Phosphoryla tion as a Function of Cell Replication Rate. Rod Balhorn, Mike Baihorn, H. P. Morris, and Roger Chalkley. 1785 Myeloid Leukemia in the Rabbit (Oryctolagus cuniculus). H. Meier,R. R. Fox,and D. D. Crary. 1788 Announcements 1789 Erratum. 1609 Standardized Nomenclature for Inbred Strains ofMice: Fifth Listing. Joan Swats. 1647 Metabolism and Biological Effects of N6-(i@2Isopentenyl)adenosine on a Cell Line Derived from Circulating Leukocytes of a Patient with Chronic Myelogenous Leukemia. Michel P. Raihbone and Ross H. Hall. 1651 A Genetic Approach to the Study of Cytotox icity and Resistance of Cultured Chinese Ham ster Cells in the Presence of Cytosine Arabino side. Diana B. Smith and Ernest H. Y. Chu. 1658 Graft versus Leukemia for â€œCell Cureâ€•of Long Passage AKR Leukemia after Chemoradio therapy. Edward C. Saltzstein, John S. Glasspiegel, Alfred A . Rimm, Roger H. Gilkr, and Morlimer M. Bortin.