Sequence alignment between 3a0r(B) and UniProt seq Q9X181 (Q9X181_THEMA):

Q9X181 (Q9X181_THEMA): Response regulator from Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8) 
                 10        20        30        40        50        60        70        80        90       100       110      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MKRILVVDDEPNIRELLKEELQEEGYEIDTAENGEEALKKFFSGNYDLVILDIEMPGISGLEVAGEIRKKKKDAKIILLTAYSHYRSDLSSWAADEYVVKSFNFDELKEKVKKLLS
         ........................................................................................X...........................
PDB seq: MKRILVVDDEPNIRELLKEELQEEGYEIDTAENGEEALKKFFSGNYDLVILDIEMPGISGLEVAGEIRKKKKDAKIILLTAYSHYRSDMSSWAADEYVVKSFNFDELKEKVKKLLS
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
                 10        20        30        40        50        60        70        80        90       100       110