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Incorporation of tem-1 and pse-4 at different sequence positions in the unselected library. The presence of sequence from tem-1 and pse-4 at seven different module positions in 79 randomly picked unselected chimeras was determined using oligonucleotide probe hybridization. Asterisks represent the percentage of chimeras with crossovers occurring between adjacent probed positions. The dashed line represents the expected percentage of genes and crossovers in an unbiased library (50%).
