Sequence alignment between 4pec(R) and UniProt seq P0AG48 (RL21_ECOLI):

P0AG48 (RL21_ECOLI): 50S ribosomal protein L21 from Escherichia coli (strain K12)
                 10        20        30        40        50        60        70        80        90       100   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MYAVFQSGGKQHRVSEGQTVRLEKLDIATGETVEFAEVLMIANGEEVKIGVPFVDGGVIKAEVVAHGRGEKVKIVKFRRRKHYRKQQGHRQWFTDVKITGISA
PDB seq: MYAVFQSGGKQHRVSEGQTVRLEKLDIATGETVEFAEVLMIANGEEVKIGVPFVDGGVIKAEVVAHGRGEKVKIVKFRRRKHYRKQQGHRQWFTDVKITGISA
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
                 10        20        30        40        50        60        70        80        90       100