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Immunolocalization of a mesenchymal antigen specific to the gastrointestinal tract

Background: The aim of the present study was to localize, at the fine structural level, a protein found by indirect immunofluorescence to be associated with the mesenchymal tissue (1) closely applied to the intervillus epithelium before the formation of intestinal crypts in the mouse fetus and (2) around intestinal crypts during and after their formation.