Sequence alignment between 3pn7(B) and UniProt seq Q26069 (Q26069_PLAMG):

Q26069 (Q26069_PLAMG): Myosin regulatory light chain from Placopecten magellanicus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160  
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--
UniProt: MADKERAQRATSNVFARLPQKLMQEMKEAFTMIDQNRDGFIDINDLKEMFSSLGRTPDDKELTAMLKEAPGPLNFTMFLSIFSDKLSGTDSEETIRNAFGMFDELDTKKLNIEYIKDLLENMGDNFNKDEMRMTFKEAPVEGGKFDYVRFVAMIKGSGDDDA
PDB seq: ----------------RLPQKLMQEMKEAFTMIDQNRDGFIDINDLKEMFSSLGRTPDDKELTAMLKEAPGPLNFTMFLSIFSDKLSGTDSEETIRNAFGMFDELDTKKLNIEYIKDLLENMGDNFNKDEMRMTFKEAPVEGGKFDYVRFVAMIKGS-----
                         ----+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------     
                            20        30        40        50        60        70        80        90       100       110       120       130       140       150