Sequence alignment between 4q2k(A) and UniProt seq P00766 (CTRA_BOVIN):

P00766 (CTRA_BOVIN): Chymotrypsinogen A 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: CGVPAIQPVLSGLSRIVNGEEAVPGSWPWQVSLQDKTGFHFCGGSLINENWVVTAAHCGVTTSDVVVAGEFDQGSSSEKIQKLKIAKVFKNSKYNSLTINNDITLLKLSTAASFSQTVSAVCLPSASDDFAAGTTCVTTGWGLTRYTNANTPDRLQQASLPLLSNTNCKKYWGTKIKDAMICAGASGVSSCMGDSGGPLVCKKNGAWTLVGIVSWGSSTCSTSTPGVYARVTALVNWVQQTLAAN
         ..........XXXXX..............................................................................XXXXXXX..............................................XX.................................................................................................
PDB seq: CGVPAIQPVL-----IVNGEEAVPGSWPWQVSLQDKTGFHFCGGSLINENWVVTAAHCGVTTSDVVVAGEFDQGSSSEKIQKLKIAKVFKNSK-------NDITLLKLSTAASFSQTVSAVCLPSASDDFAAGTTCVTTGWGLTRY--ANTPDRLQQASLPLLSNTNCKKYWGTKIKDAMICAGASGVSSCMGDSGGPLVCKKNGAWTLVGIVSWGSSTCSTSTPGVYARVTALVNWVQQTLAAN
         ---------+     ----+---------+---------+---------+---------+---------+---------+---------+---       ---------+---------+---------+---------+------  -+---------+---------+---------+---------+---------+---------+---------+---------+---------+-----
                 10        20        30        40        50        60        70        80        90                 110       120       130       140       150       160       170       180       190       200       210       220       230       240