Sequence alignment between 6t90(B) and UniProt seq P62805 (H4_HUMAN):

P62805 (H4_HUMAN): Histone H4 from Homo sapiens
                 10        20        30        40        50        60        70        80        90       100   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MSGRGKGGKGLGKGGAKRHRKVLRDNIQGITKPAIRRLARRGGVKRISGLIYEETRGVLKVFLENVIRDAVTYTEHAKRKTVTAMDVVYALKRQGRTLYGFGG
PDB seq: ---------------------VLRDNIQGITKPAIRRLARRGGVKRISGLIYEETRGVLKVFLENVIRDAVTYTEHAKRKTVTAMDVVYALKRQGRTLYGFGG
                              --------+---------+---------+---------+---------+---------+---------+---------+---
                                     30        40        50        60        70        80        90       100