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Motilin cells were investigated in the GI-tract of various laboratory animals by immunfluorescence. The distribution of motilin cells was compared to enterochromaffin (EC) cell localization. Simultaneously histochemistry for EC-cells and motilin cells was carried out. The results indicate that motilin is not produced within the EC-cells. Present classification of motilin cells on ultrastructural evidence is therefore not yet possible.
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