Sequence alignment between 4s1x(A) and UniProt seq A8TXX2 (A8TXX2_9ORTO):

A8TXX2 (A8TXX2_9ORTO): Truncated hemagglutinin (Fragment) from unidentified influenza virus
                 10        20        30        40        50        60        70        80 
         ---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: FRHQNSEGTGQAADLKSTQAAIDQINGKLNRVIEKTNEKFHQIEKEFSEVEGRIQDLEKYVEDTKIDLWSYNAELLVALEN
         ..................XXX.......X......XXXX.................X........................
PDB seq: ------------------WGSIDQINGKMNRVIEK----FHQIEKEFSEVEGRIQDMEKY---------------------
                           --------+--------    -------+---------+---                     
                                  50                  70        80