Sequence alignment between 1a13(A) and UniProt seq P01515 (MAST_VESXA):

P01515 (MAST_VESXA): Mastoparan-X from Vespa xanthoptera 
                 10     
         ---------+----
UniProt: INWKGIAAMAKKLL-
PDB seq: INWKGIAAMAKKLLX
         ---------+-----
                 10