Integrative conjugative elements mobilizing the yersiniabactin cluster. Type A ICE (group VI as defined by Marcoleta et al. [32]) identified in strain 48-IT and type B ICE (group VI-like) identified in strain H151440671-UK are drawn indicating their integration sites with respect to the tRNA genes (tRNA Asn1A, 1B, 1C and 1D as described in Marcoleta et al. [32]) as detected in the complete genome sequence of strain CAV1193, which does not contain ICEs. Arrows indicate genes and their direction of transcription. Colours indicate clusters encoding the yersiniabactin system (brown), Type IV secretion system (green), hypothetical proteins (blue) and other ICE-associated genes (yellow), respectively. R, restriction; M, methylation; RT, reverse transcriptase.