Sequence alignment between 4gu2(A) and UniProt seq C4M760 (C4M760_ENTHI):

C4M760 (C4M760_ENTHI): Ubiquitin, putative from Entamoeba histolytica (strain ATCC 30459 / HM-1:IMSS / ABRM)
                 10        20        30        40        50        60        70       
         ---------+---------+---------+---------+---------+---------+---------+-------
UniProt: MQIFVKTLTGKTITLEVEPNDSIDAIKAKIQEKEGIPPDQQRLIFAGKQLEEGKTLSDYNIQKESTLHLVLRLRGGY
         ......XXXX...................................................................
PDB seq: MQIFVK----KTITLEVEPNDSIDAIKAKIQEKEGIPPDQQRLIFAGKQLEEGKTLSDYNIQKESTLHLVLR-----
         ------    ---------+---------+---------+---------+---------+---------+--     
                           20        30        40        50        60        70