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DELETION MAPPING OF THE 
REX GENE
Gary N. Gussin 1, Victoria Peterson 1, and Nancy Loeb 1
1 Department of Zoology, University of Iowa, Iowa City, Iowa 52242
Deletion mapping has been used to order 12 
rex- mutants. Correlation of recombination data with physically-determined positions of deletion end-points (Szybalski 1971; Blattner et al. 1972) suggests that the left-most rex- mutation, rex209, is located about 260-300 nucleotide pairs from the pL mutation sex1 and about 475 nucleotide pairs from the left end-point of the region of nonhomology with imm434.
Revised on March 20, 1973