Sequence alignment between 3qqc(E) and UniProt seq Q8U440 (SPT4_PYRFU):

Q8U440 (SPT4_PYRFU): Transcription elongation factor Spt4 from Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1) 
                 10        20        30        40        50        60 
         ---------+---------+---------+---------+---------+---------+-
UniProt: MSEKACRHCHYITSEDRCPVCGSRDLSEEWFDLVIIVDVENSEIAKKIGAKVPGKYAIRVR
PDB seq: --EKACRHCHYITSEDRCPVCGSRDLSEEWFDLVIIVDVENSEIAKKIGAKVPGKYAIRV-
           -------+---------+---------+---------+---------+---------+ 
                 10        20        30        40        50        60