Sequence alignment between 2y9h(O) and UniProt seq Q53WG9 (CAS6_THET8):

Q53WG9 (CAS6_THET8): CRISPR-associated endoribonuclease Cse3 from Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8)
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         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: -MWLTKLVLNPASRAARRDLANPYEMHRTLSKAVSRALEEGRERLLWRLEPARGLEPPVVLVQTLTEPDWSVLDEGYAQVFPPKPFHPALKPGQRLRFRLRANPAKRLAATGKRVALKTPAEKVAWLERRLEEGGFRLLEGERGPWVQILQDTFLEVRRKKDGEEAGKLLQVQAVLFEGRLEVVDPERALATLRRGVGPGKALGLGLLSVAP
         ...................................................XXXXX...............XXXXX..............................................................XXXXXX..........XXXXXXXXXXXXXXXXXXX.......................................
PDB seq: AMWLTKLVLNPASRAARRDLANPYEMHRTLSKAVSRALEEGRERLLWRLEP-----PPVVLVQTLTEPDWS-----YAQVFPPKPFHPALKPGQRLRFRLRANPAKRLAATGKRVALKTPAEKVAWLERRLEEGGFRL------PWVQILQDTF-------------------AVLFEGRLEVVDPERALATLRRGVGPGKALGLGLLSVAP
         ----------+---------+---------+---------+---------+     ----+---------+     ----+---------+---------+---------+---------+---------+-------      ------+---                   -------+---------+---------+---------+-
                  10        20        30        40        50        60        70        80        90       100       110       120       130                 150                           180       190       200       210