Sequence alignment between 2ecs(A) and UniProt seq P03040 (RCRO_LAMBD):

P03040 (RCRO_LAMBD): Regulatory protein cro from Escherichia phage lambda
                 10        20        30        40        50        60      
         ---------+---------+---------+---------+---------+---------+------
UniProt: MEQRITLKDYAMRFGQTKTAKDLGVYQSAINKAIHAGRKIFLTINADGSVYAEEVKPFPSNKKTTA
         ..........................X.X..X..................................
PDB seq: MEQRITLKDYAMRFGQTKTAKDLGVYPSSINQAIHAGRKIFLTINADGSVYAEEVKPFPS------
         ---------+---------+---------+---------+---------+---------+      
                 10        20        30        40        50        60