Sequence alignment between 3bg4(A) and UniProt seq P00767 (CTRB_BOVIN):

P00767 (CTRB_BOVIN): Chymotrypsinogen B from Bos taurus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240     
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-----
UniProt: CGVPAIQPVLSGLARIVNGEDAVPGSWPWQVSLQDSTGFHFCGGSLISEDWVVTAAHCGVTTSDVVVAGEFDQGLETEDTQVLKIGKVFKNPKFSILTVRNDITLLKLATPAQFSETVSAVCLPSADEDFPAGMLCATTGWGKTKYNALKTPDKLQQATLPIVSNTDCRKYWGSRVTDVMICAGASGVSSCMGDSGGPLVCQKNGAWTLAGIVSWGSSTCSTSTPAVYARVTALMPWVQETLAAN
PDB seq: CGVPAIQPVLS------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         ---------+-                                                                                                                                                                                                                                          
                 10