Sequence alignment between 3avr(B) and UniProt seq P68431 (H31_HUMAN):

P68431 (H31_HUMAN): Histone H3.1 from Homo sapiens
                 10        20        30        40        50        60        70        80        90       100       110       120       130      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MARTKQTARKSTGGKAPRKQLATKAARKSAPATGGVKKPHRYRPGTVALREIRRYQKSTELLIRKLPFQRLVREIAQDFKTDLRFQSSAVMALQEACEAYLVGLFEDTNLCAIHAKRVTIMPKDIQLARRIRGERA
         ...........................X............................................................................................................
PDB seq: -----------------RKQLATKAARXSAPATG------------------------------------------------------------------------------------------------------
                          ---+---------+---                                                                                                      
                            20        30