Sequence alignment between 4xw6(B) and UniProt seq P61926 (IPKA_RABIT):

P61926 (IPKA_RABIT): cAMP-dependent protein kinase inhibitor alpha from Oryctolagus cuniculus
                 10        20        30        40        50        60        70      
         ---------+---------+---------+---------+---------+---------+---------+------
UniProt: MTDVETTYADFIASGRTGRRNAIHDILVSSASGNSNELALKLAGLDINKTEGEEDAQRSSTEQSGEAQGEAAKSES
         ....................XX......................................................
PDB seq: -----TTYADFIASGRTGRRACIHD---------------------------------------------------
              -----+---------+----                                                   
                 610       620