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(A) The inverted repeat sequences in CTP1 and PCA1 that define the breakpoints of a specific SUL1 amplification event [7]. (B) The structure of the wild type SUL1 locus that includes the nearby origin of replication, ARS228. (C) The inferred structure of the head-to-head/tail-to-tail 5× SUL1 amplification product recovered after selective growth of a haploid yeast strain in medium limiting for sulfur.
