Sequence alignment between 1pcs(A) and UniProt seq P21697 (PLAS_SYNY3):

P21697 (PLAS_SYNY3): Plastocyanin from Synechocystis sp. (strain PCC 6803 / Kazusa)
                 10        20        30        40        50        60        70        80        90       100       110       120      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MSKKFLTILAGLLLVVSSFFLSVSPAAAANATVKMGSDSGALVFEPSTVTIKAGEEVKWVNNKLSPHNIVFAADGVDADTAAKLSHKGLAFAAGESFTSTFTEPGTYTYYCEPHRGAGMVGKVVVE
         .......................................................................X....X............X....................................
PDB seq: ----------------------------ANATVKMGSDSGALVFEPSTVTIKAGEEVKWVNNKLSPHNIVFDADGVPADTAAKLSHKGLLFAAGESFTSTFTEPGTYTYYCEPHRGAGMVGKVVVE
                                     -----------+---------+---------+---------+--------+-----------------+---------+---------+---------
                                               10        20        30        40       50                70        80        90