Sequence alignment between 1ab6(A) and UniProt seq P0AE67 (CHEY_ECOLI):

P0AE67 (CHEY_ECOLI): Chemotaxis protein CheY from Escherichia coli (strain K12)
                 10        20        30        40        50        60        70        80        90       100       110       120         
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
UniProt: MADKELKFLVVDDFSTMRRIVRNLLKELGFNNVEEAEDGVDALNKLQAGGYGFVISDWNMPNMDGLELLKTIRADGAMSALPVLMVTAEAKKENIIAAAQAGASGYVVKPFTAATLEEKLNKIFEKLGM
         .............X.......................................................................X...........................................
PDB seq: ----ELKFLVVDDNSTMRRIVRNLLKELGFNNVEEAEDGVDALNKLQAGGYGFVISDWNMPNMDGLELLKTIRADGAMSALPVLMTTAEAKKENIIAAAQAGASGYVVKPFTAATLEEKLNKIFEKLGM
             -----+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
                 10        20        30        40        50        60        70        80        90       100       110       120