APPENDIX A 
6 
7. A unique bacteriophage, $3T, exists that carries a gene that 
can be readily purified for "scaffolding" experiments. 
b. Disadvantages 
1. The knowledge of genetics and physiology of plasmids and 
viruses is primitive compared with £. col i . 
2. High-frequency, specialized transduction is not available 
as a means of gene enrichment. 
Based on its promise, it seems appropriate, and not chauvinistic, to 
urge development of this system. 
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