CPA3 and Alzheimer disease: Seeing the relatively mild impact of the MC specific chymase mMCP-4 on the MC903-induced AD-like model we finally scored the ear thickness as well as MC and granulocyte infiltration in 12 to 18 weeks old C57BL/6J Taconic mice lacking the tryptase mMCP-6 or the carboxypeptidase A3 (CPA3).