48 
25. Thomas, M., J.R. Cameron and R.W, Davis (1974). Viairle Molecular 
Hybrids of Bacteriophage Lambda and Eukaryotic DNA. Rroc. Nat. Acad. 
Sci. USA 71, 4579-4583. 
26. Murray, N.E. and K. Murray (1974). Manipulatlbn of Restriction 
Targets in Phage X to form Receptor Chromosomes for DNA Fragments . 
Nature 251, 4)6-481. " 
27. Rambach, A. and P. Tiollais (1974). Bacteriophaye A Having EcoRI 
Endonuclease Sites only in the Non-essential Region of the Genome . 
Proc. Nat. Acad. Sci. USA 71, 3927-3930. 
28. Smith, H.W. (1975)., Survival of Orally-Administered Escherichia 
coli K12 in the Alimentary Tract of Man . Nature 255 , 500-502. 
29. Anderson, E.S. (1975). Viability of, and Transfer of a Plasmid from 
Escherichia coli K12 in the human intestine. Nature 255 , 502-504. 
30. Falkow, S. (1975). Unpublished experiments quoted in Appendix D of the 
Report of the Organizing Committee of the Asilomar Conference on Re- 
combinant DNA Molecules (P. Berg, D'. Baltimore, S. Brenner, R.O. Roblin 
and M. Singer, eds.) submitted to the National Academy of Sciences. 
31. R. Curtiss III, personal communication. 
32. Novick, R.P. and S.I. Morse (1967). In Vivo Transmission of Drug Resistance 
Factors between Strains of Staphylococcus aureus . J. Exp. Med. 1 25 , 45-59. 
33. Anderson, J.D., W.A. Gillespie and M.H. Richmond. 1974. Chemotherapy 
and Antibiotic Resistance Transfer between Enterobacteria in the Human 
Gastrointestinal Tract . J. Med. Microbiol. 6^, 461 -473. 
34. Ronald Davis, personal communication. 
35. K. Murray, personal communication; W. Szybalski, personal communication. 
36. Manly, K.R., E.R. Signer and C.M. Radding (1969). Nonessential 
Functions of Bacteriophage X . Virology 37 177. 
37. Gottesman, M.E. and R.A. Weisberg (1971). Prophage Insertion and Excision . 
In The Bacteriophage Lambda (A.D. Hershey, ed.). Cold Spring Harbor 
Laboratory pp. 113-138. 
38. Shimada, K., R.A. Weisberg and M.E. Gottesman (1972). Prophage Lambda 
at Unusual Chromosomal Locations: I. Location of the Secondary Attach- 
ment Sites and the Properties of the Lysogens . J. Mol. Biol. 63^, 483-503. 
[ 119 ] 
