Sequence alignment between 5fxb(A) and UniProt seq Q7VYU0 (CRCB_BORPE):

Q7VYU0 (CRCB_BORPE): Putative fluoride ion transporter CrcB from Bordetella pertussis (strain Tohama I / ATCC BAA-589 / NCTC 13251) 
                 10        20        30        40        50        60        70        80        90       100       110       120        
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MLTYAPLNFIAIGIGATLGAWLRWVLGLRLNGAGWPWGTLTANLVGGYLIGVMVALIASHPEWPAWIRLAAVTGFLGGLTTFSTFSAETVDMLERGVYATAAAYAGASLAGSLAMTGLGLATVRLLLR
         ............................X................................................................X..................................
PDB seq: -LTYAPLNFIAIGIGATLGAWLRWVLGLKLNGAGWPWGTLTANLVGGYLIGVMVALIASHPEWPAWIRLAAVTGFLGGLTTFSTFSAETVDMLCRGVYATAAAYAGASLAGSLAMTGLGLATVRLLLR
          --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
                 10        20        30        40        50        60        70        80        90       100       110       120