Sequence alignment between 1fn4(A) and UniProt seq P01835 (KACB_RAT):

P01835 (KACB_RAT): Ig kappa chain C region, B allele from Rattus norvegicus
                                                                                                                          10        20        30        40        50        60        70        80        90       100      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: ---------------------------------------------------------------------------------------------------------ADAAPTVSIFPPSTEQLATGGASVVCLMNNFYPRDISVKWKIDGTERRDGVLDSVTDQDSKDSTYSMSSTLSLTKADYESHNLYTCEVVHKTSSSPVVKSFNRNEC
         .........................................................................................................XXX.......................................................................................................
PDB seq: DIKLTQSPSLLSASVGDRVTLSCKGSQNINNYLAWYQQKLGEAPKLLIYNTNSLQTGIPSRFSGSGSGTDYTLTISSLQPEDVATYFCYQYNNGYTFGAGTKLELKRTAPTVSIFPPSTEQLATGGASVVCLMNNFYPRDISVKWKIDGTERRDGVLDSVTDQDSKDSTYSMSSTLSLTKADYESHNLYTCEVVHKTSSSPVVKSFNRNEC
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+--------+----------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
                 10        20        30        40        50        60        70        80        90      100        110       120       130       140       150       160       170       180       190       200       210