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The pigX gene encodes a GGDEF/EAL domain protein. (A) Genomic location of pigX, indicating the transcriptional start site (+1) and the insertion sites of transposons (black triangles) in strains HSPIG66 (1), ROP4S (2), and ROP4 (3). (B) Predicted GGDEF/EAL protein domain structure and inner membrane (IM) localization of PigX. OM, outer membrane; PL, periplasmic loop.
