Acts as a ventralizing factor during embryogenesis. Inhibits axin-mediated JNK activation by binding axin and disrupting axin homodimerization. This in turn antagonizes a Wnt/beta-catenin- independent dorsalization pathway activated by AXIN/JNK-signaling (By similarity). . This is the function of AIDA (axin interactor, dorsalization associated, ENSG00000186063).