Sequence alignment between 6udb(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...............................................................X.................................................
PDB seq: ------------------------------------AEAGITGTWYNQLGSTFIVTAGADGALTGTYES-VGNAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSATTWSGQYVGGAEARINTQWLXTSGTTEANAWKSTLVGHDTFTKVKP------------------------
                                             -------+---------+---------+----- ---+---------+---------+---------+---------+---------+---------+---------+---------+-----                        
                                                   20        30        40        50        60        70        80        90       100       110       120       130