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Shotgun collections of Charon 3A bacteriophages containing Eco RI fragments of human and mouse DNA were constructed with the use of in vitro packaging. Plaques were screened by hybridization, and globin-specific clones were isolated from both human (Charon 3AHs51.1) and mouse (Charon 3AMm30.5). The fragments cloned were detected in unfractionated genomic DNA by the Southern method of hybridization.
Blattner et al. (Fri,) studied this question.