Sequence alignment between 6t1k(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..............................................................X.X....X.X......................................
PDB seq: -------------------------------------EAGITGTWYNQLGSTFIVTAGADGALTGTYESAAGKAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSATTWSGQYVGGAEARINTQWLLTAGQTEANGWASTLVGHDTFTKVKPS-----------------------
                                              ------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------                       
                                                   20        30        40        50        60        70        80        90       100       110       120       130