Also, there is commercially available is a purified recombinant protein produced by introducing into murine cells a fused gene obtained by linking cDNA having a sequence coding for the Fc region of human IgG and an His tag sequence to cDNA coding for the extracellular region of murine or human E-cadherin, and expressing the recombinant protein (Recombinant Human/Mouse E-cadherin-Fc Chimera; R&D sy