Sequence alignment between 3unb(I) and UniProt seq Q9R1P1 (PSB3_MOUSE):

Q9R1P1 (PSB3_MOUSE): Proteasome subunit beta type-3 from Mus musculus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200     
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-----
UniProt: MSIMSYNGGAVMAMKGKNCVAIAADRRFGIQAQMVTTDFQKIFPMGDRLYIGLAGLATDVQTVAQRLKFRLNLYELKEGRQIKPYTLMSMVANLLYEKRFGPYYTEPVIAGLDPKTFKPFICSLDLIGCPMVTDDFVVSGTCSEQMYGMCESLWEPNMDPEHLFETISQAMLNAVDRDAVSGMGVIVHVIEKDKITTRTLKARMD
PDB seq: -SIMSYNGGAVMAMKGKNCVAIAADRRFGIQAQMVTTDFQKIFPMGDRLYIGLAGLATDVQTVAQRLKFRLNLYELKEGRQIKPYTLMSMVANLLYEKRFGPYYTEPVIAGLDPKTFKPFICSLDLIGCPMVTDDFVVSGTCSEQMYGMCESLWEPNMDPEHLFETISQAMLNAVDRDAVSGMGVIVHVIEKDKITTRTLKARMD
          ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+----
                  10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200