Sequence alignment between 1b4c(A) and UniProt seq P04631 (S100B_RAT):

P04631 (S100B_RAT): Protein S100-B from Rattus norvegicus
                 10        20        30        40        50        60        70        80        90  
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+--
UniProt: MSELEKAMVALIDVFHQYSGREGDKHKLKKSELKELINNELSHFLEEIKEQEVVDKVMETLDEDGDGECDFQEFMAFVSMVTTACHEFFEHE
PDB seq: MSELEKAMVALIDVFHQYSGREGDKHKLKKSELKELINNELSHFLEEIKEQEVVDKVMETLDEDGDGECDFQEFMAFVSMVTTACHEFFEHE
         ----------+---------+---------+---------+---------+---------+---------+---------+---------+-
                  10        20        30        40        50        60        70        80        90