By Albert Neuberger, L. L. M. Van Deenen, Giorgio Semenza
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Coli B after infection with the gene 42 mutant, am N122, could be detected, active enzyme could be demonstrated if the host were E. coli C600 or E. coli CS P . The kinetics of production of enzyme as a function of time of infection and pH differed significantly. The same findings were also made with other amber mutants in gene 42, am N269, am N55 and am N211. The formation of mutant enzymes is of course dependent on the presence of transfer RNAs in the permissive host capable of reading the stop codon as a codon for one of the amino acids.
One advantage of the T5 system is that the process of infection of E. coli F can be divided into discrete steps . After adsorption of the phage, 8% of its DNA is initially transferred (FST-DNA) into the host in the presence of protein synthesis and in a temperature-dependent manner A BACKWARD GLANCE 47 [225,226]. If protein synthesis is blocked at this step, the phagebacterium complexes remain in a state of partial DNA transfer. When protein synthesis is allowed to continue, the remaining 92 % of the phage DNA is transferred, but only after a 3- to 4-min period of protein synthesis.
During the previous year I had spent a month as a visiting professor at the University of Texas at the invitation of William Shive. M. BUCHANAN and of his prediction that both folate and vitamin B 12 would be involved in methionine synthesis [96,97]. Of course, duVigneaud  in his research described in A Trail of Research describes his work on methyl synthesis in the rat and the role of folate and vitamin B 12 as complementary agents in animal nutrition. Likewise, my good friend Thomas Jukes  had made several notable contributions to this problem in his capacity of director of a large productive group at Lederle Laboratories.
A History of Biochemistry: Selected Topics in the History of Biochemistry Personal Recollections. II. by Albert Neuberger, L. L. M. Van Deenen, Giorgio Semenza