Sequence alignment between 1cn4(C) and UniProt seq P01588 (EPO_HUMAN):

P01588 (EPO_HUMAN): Erythropoietin from Homo sapiens
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MGVHECPAWLWLLLSLLSLPLGLPVLGAPPRLICDSRVLERYLLEAKEAENITTGCAEHCSLNENITVPDTKVNFYAWKRMEVGQQAVEVWQGLALLSEAVLRGQALLVNSSQPWEPLQLHVDKAVSGLRSLTTLLRALGAQKEAISPPDAASAAPLRTITADTFRKLFRVYSNFLRGKLKLYTGEACRTGDR
         ..................................................X.............X............................................X........................................XXXXXXX....................................
PDB seq: ----------------------------PPRLICDSRVLERYLLEAKEAEKITTGCAEHCSLNEKITVPDTKVNFYAWKRMEVGQQAVEVWQGLALLSEAVLRGQALLVKSSQPWEPLQLHVDKAVSGLRSLTTLLRALGAQKEAISPPD-------RTITADTFRKLFRVYSNFLRGKLKLYTGEACR----
                                     --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---       ---------+---------+---------+--    
                                            10        20        30        40        50        60        70        80        90       100       110       120                 140       150       160