Sequence representation of the different clyA deletion variants (indicated by roman numerals I-IV) found among different E. coli isolates with mutant clyA loci: ECOR51 (Δ clyA I), ECOR61 (Δ clyA II), 536 (Δ clyA III) and ECOR43 (Δ clyA IV). Position coordinates are relative to the clyA start codon in E. coli K-12. Sequence repeats are indicated by red underlined bold face and are highlighted with arrows. The extent of the IS2 element is indicated by a black bar. (A) Deletions in the clyA upstream region and N-terminal coding sequences. (B) Deletions in the clyA C-terminal coding sequences.