Sequence alignment between 1fn4(B) and UniProt seq P20760 (IGG2A_RAT):

P20760 (IGG2A_RAT): Ig gamma-2A chain C region from Rattus norvegicus
                                                                                                                                     10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320  
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--
UniProt: --------------------------------------------------------------------------------------------------------------------AETTAPSVYPLAPGTALKSNSMVTLGCLVKGYFPEPVTVTWNSGALSSGVHTFPAVLQSGLYTLTSSVTVPSSTWSSQAVTCNVAHPASSTKVDKKIVPRECNPCGCTGSEVSSVFIFPPKTKDVLTITLTPKVTCVVVDISQNDPEVRFSWFIDDVEVHTAQTHAPEKQSNSTLRSVSELPIVHRDWLNGKTFKCKVNSGAFPAPIEKSISKPEGTPRGPQVYTMAPPKEEMTQSQVSITCMVKGFYPPDIYTEWKMNGQPQENYKNTPPTMDTDGSYFLYSKLNVKKETWQQGNTFTCSVLHEGLHNHHTEKSLSHSPGK
         ....................................................................................................................XXX.XX..X.....X.XXX.................................................................................X.............................................................................................................................................................................................................................
PDB seq: QVQLLESGPGLVRPSETLSLTCTVSGFSLTSFSVSWVRHPSGKGPEWMGRMWYDGYTAYNSALKSRLSISRDTSKNQVFLKMNSLQTDDTGTYYCTRDLYGGYPLGFWYFDFWGPGTMVTVSSVFPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGALSSGVHTFPAVLQSGLYTLTSSVTVPSSTWSSQAVTCNVAHPASSTKVDKKIVPRDC----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         ---------+---------+---------+---------+---------+---------+---------+---------+------------+---------+----+-----------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------                                                                                                                                                                                                                            
                 10        20        30        40        50        60        70        80           90       100 100E         110       120       130       140       150       160       170       180       190       200