Relative levels of lipid transporters, caveolin 2 or FABP in CLD, in proportion to the content of the original homogenate, are 10 to 50 times greater than that of other membrane markers (aminopeptidase, alkaline phosphatase or NADPH cytochrome C reductase), suggesting a true expression rather than contamination. This evidence concerns the gene CAV2 and congenital secretory chloride diarrhea 1.