Sequence alignment between 1nkd(A) and UniProt seq P03051 (ROP_ECOLX):

P03051 (ROP_ECOLX): Regulatory protein rop from Escherichia coli
                 10        20         30         40        50        60   
         ---------+---------+--------- +- --------+---------+---------+---
UniProt: MTKQEKTALNMARFIRSQTLTLLEKLNEL-DA-DEQADICESLHDHADELYRSCLARFGDDGENL
         .............................X..X................................
PDB seq: MTKQEKTALNMARFIRSQTLTLLEKLNELADAADEQADICESLHDHADELYRSCLARFG------
         ---------+---------+---------+---------+---------+---------      
                 10        20        30        40        50