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Fig. 1. Atomic force image of purified dimeric N-cadherin-Fc fusion protein adsorbed to a mica surface. The two curved `arms' in each molecule are the five extracellular domains of N-cadherin, which are joined to the Fc region. The thickness of the deposited molecules is reflected in their shading and approximate values were obtained; 5 nm for the more intensely white Fc region and 3 nm for the cadherin domains.