Table 1. Short repetitive sequence groups in the SBW25 genome.

Groupa	Sequenceb	Occurrences	Palindromic corec
I	GTGGGAGGGGGCTTGC	618	GGGGGCTTGCCCCC
II	GTGAGCGGGCTTGCCC	241	GCGGGCTTGCCCCGC
III	GAGGGAGCTTGCTCCC	208	GGGAGCTTGCTCCC

^a16-mers were sorted into three groups (GI, GII and GIII) using a grouping algorithm (Figure S3 and Figure S4).

^bSequence of the most common 16-mer from each group.

^cEach GI, GII and GIII sequence either contains, or overlaps, an imperfect palindrome (the palindromic core).