THE cadherins mediate cell adhesion and play a fundamental role in normal development(1). They participate in the maintenance of proper cell-cell contacts : for example, reduced levels of epithelial cadherin (E-cadherin) correlate with increased invasiveness in many human tumour cell types(2,3). The cadherins typically consist of five tandemly repeated extracellular domains, a single membrane-spanning segment and a cytoplasmic region(4-6). The N-terminal extracellular domains mediate cell-cell contact(7) while the cytoplasmic region interacts with the cytoskeleton through the catenins(8). Cadherins depend on calcium for their function : removal of calcium abolishes adhesive activity, renders cadherins vulnerable to proteases (reviewed in ref, 4) and, in E-cadherin, induces a dramatic reversible conformational change in the entire extracellular region(9). We report here the X-ray crystal structure at 2.0 Angstrom resolution of the two N-terminal extracellular domains of E-cadherin in the presence of calcium. The structure reveals a two-fold symmetric dimer, each molecule of which binds a contiguous array of three bridged calcium ions. Not only do the bound calcium ions linearize and rigidify the molecule, they promote dimerization. Although the N-terminal domain of each molecule in the dimer is aligned in a parallel orientation, the interactions between them differ significantly from those found in the neural cadherin (N-cadherin) N-terminal domain (NCD1) structure(10). The E-cadherin dual-domain structure reported here defines the role played by calcium in the cadherin-mediated formation and maintenance of solid tissues.