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Structure of the λ h434 imm21 genome. The λ h434 imm21 genome is shown at the top, with DNAs from different parents indicated by different colors. See the text for discussion of the following unexpected sequences: 434 DNA in the left end terS gene region and a patch of λ DNA in the imm21 region. The exchange that generated the h434 allele is shown at the bottom, with the genes in the region indicated.
