| genetic evolution of bacteriophage. i. hybrids between unrelated bacteriophages p22 and fels 2. | a new bacteriophage species, designated f22, was isolated from phage p22 stocks grown on salmonella typhimurium q1 lysogenic for fels 2 at a frequency of less than 10(-11). p22 has a very short tail with a hexagonal base plate and six spikes. phage fels 2 is morphologically similar to e. coli t-even phages, having a long tail with a contractile sheath and carrying no genetic region related to p22. phage f22 is morphologically and serologically indistinguishable from fels 2, but carries the c(c(1 ... | 1969 | 4890254 |