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This is expected from the IRF scoring scheme, which allows more imperfections at longer copy lengths.
Moreover, the proportional overrepresentation of perfect IRs becomes more pronounced at longer copy lengths.
We considered only IRs with spacer lengths between 0 and 76 and copy lengths greater than 6.
Moreover, the average copy lengths of overlapping IRs do not differ greatly between the S. cerevisiae genome and its randomizations.
Excluding this case, the S. cerevisiae genome contains several overlapping IRs with copy lengths in the range of 300 400 bp.
In particular, overlapping IRs have larger average spacer lengths than non-overlapping IRs (~38.5 bp vs. ~33.2 bp), and slightly longer copy lengths (~11.2 bp vs. ~10.1 bp).
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Marketing Experiments did a series of tests for clients to show the effect of copy length on Website conversion rates.
For the 20 clusters with the best score ( = total copy length * copy pair amount), we performed a motif search with at least 60% sequence identity on both strands and in both directions.
Their inherent features are copy length (or right and left copy length for imperfect IRs), spacer length, degree of perfection, percent A+T composition, dinucleotide repeat content, percent match, percent insertion deletion, and IRF score.
The longest perfect IR found in the S. cerevisiae genome had copy length 30, while the average number of perfect IRs with copy length larger than 15 was less than one both in the R and in the RA genomes.
For repeat numbers n = 1 or 2, the IR count is weakly positively correlated with copy length.
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CEO of Professional Science Editing for Scientists @ prosciediting.com