Sequence alignment between 3d5b(V) and UniProt seq Q72HR2 (RL21_THET2):

Q72HR2 (RL21_THET2): 50S ribosomal protein L21 from Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27)
                 10        20        30        40        50        60        70        80        90       100 
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: MFAIVKTGGKQYRVEPGLKLRVEKLDAEPGATVELPVLLLGGEKTVVGTPVVEGASVVAEVLGHGRGKKILVSKFKAKVQYRRKKGHRQPYTELLIKEIRG
PDB seq: MFAIVKTGGKQYRVEPGLKLRVEKLDAEPGATVELPVLLLGGEKTVVGTPVVEGASVVAEVLGHGRGKKILVSKFKAKVQYRRKKGHRQPYTELLIKEIRG
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
                 10        20        30        40        50        60        70        80        90       100