E.C.3.4.21.72; IgA protease; IgA proteinase; IgA-specific metalloendopeptidase;IgA-specific proteinase; IgA1-specific serine endopeptidase; Igametalloproteinase; Immunoglobulin A metalloproteinase; Immunoglobulin Aprotease; Immunoglobulin A proteinase