Sequence alignment between 4n9f(a) and UniProt seq Q13951 (PEBB_HUMAN):

Q13951 (PEBB_HUMAN): Core-binding factor subunit beta from Homo sapiens
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180  
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--
UniProt: MPRVVPDQRSKFENEEFFRKLSRECEIKYTGFRDRPHEERQARFQNACRDGRSEIAFVATGTNLSLQFFPASWQGEQRQTPSREYVDLEREAGKVYLKAPMILNGVCVIWKGWIDLQRLDGMGCLEFDEERAQQEDALAQQAFEEARRRTREFEDRDRSHREEMEVRVSQLLAVTGKKTTRP
         .........................................................................XXXXXXXXX....................................................................................................
PDB seq: --RVVPDQRSKFENEEFFRKLSRECEIKYTGFRDRPHEERQARFQNACRDGRSEIAFVATGTNLSLQFFPASW---------REYVDLEREAGKVYLKAPMILNGVCVIWKGWIDLQRLDGMGCLEFDEERAQQEDALAQQAFEEARRRTREFEDRD-------------------------
           -------+---------+---------+---------+---------+---------+---------+---         -------+---------+---------+---------+---------+---------+---------+-------                         
                 10        20        30        40        50        60        70                  90       100       110       120       130       140       150