Sequence alignment between 1n4j(A) and UniProt seq P22629 (SAV_STRAV):

P22629 (SAV_STRAV): Streptavidin from Streptomyces avidinii
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MRKIVVAAIAVSLTTVSITASASADPSKDSKAQVSAAEAGITGTWYNQLGSTFIVTAGADGALTGTYESAVGNAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSATTWSGQYVGGAEARINTQWLLTSGTTEANAWKSTLVGHDTFTKVKPSAASIDAAKKAGVNNGNPLDAVQQ
         ..............................................X.....................XXXXX..............................................................................................................
PDB seq: ---------------------------------------GITGTWYAQLGSTFIVTAGADGALTGTYE-----AESRYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSATTWSGQYVGGAEARINTQWLLTSGTTEANAWKSTLVGHDTFTKV--------------------------
                                                ----+---------+---------+----     +---------+---------+---------+---------+---------+---------+---------+---------+---                          
                                                   20        30        40        50        60        70        80        90       100       110       120       130