16. Armen tano, D. , S.-F. Yu, P.W. Kantoff, T. von Ruden, W.F. Anderson, and E. 
Gilboa. Novel retroviral vectors used for efficient transfer and 
expression of the human ADA cDNA: Role of internal viral sequences. J. 
Virol, in press. 
17. Pike, B.L. and W.A. Robinson. 1970. Hunan bone marrow colony growth in 
Agar-gel. J, Cell Physiol. 76:77-84. 
18. Gregory, C.J. and A.C. Eaves. 1977. Human marrow cells capable of 
erythropoietic differentiation in vitro: Definition of three erythroid 
colony responses. Blood 49:855-864. 
19. Gross-Bellard, M., P. CXidet, and P. Chambon. 1973. Isolation of high 
molecular weight DNA from manrvalian cells. Eur. J. Biochem. 36:32-38. 
20. Southern, E. 1975. Detection of specific sequences amoung DNA 
fragments separated by gel electrophoresis. J. Mol. Biol. 
98:503-517. 
21. McLachlin, J.R. , S.C. Bernstein, and W.F. Anderson. 1986. Separation of 
human from mouse and monkey adenosine deaminase by ion exchange 
chromatography following retroviral mediated gene transfer. Analy. 
Biochem. In press. 
22. Soberman, R.J., and M.L. Kamov sky. 1980. Metabolism of purines in 
macrophages. Effect of functional state of the cells. J. Exp. Med. 
152:241. 
23. Reiss, B., R. Sprengel, H. Will, and H. Schaller. 1984. A new sensitive 
method for qualitative and quantitative assay of neomycin 
phosphotransferase in crude cell extracts. Gene 30:211-218. 
24. Singer, R.H., J.B. Lawrence, and C. Villnave. 1986. Optimization of in 
situ hybridization using isotopic and non-isotopic detection methods. 
BioTechniques 4:230-250. 
Recombinant DNA Research, Volume 12 
[297] 
