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The in vitro electrical properties of rat jejunum were utilized to assay a factor or factors in serum from patients with cystic fibrosis (CF). Sera from patients with CF were found to decrease short circuit current (SCC) and the SCC response to glucose, and to increase electrical resistance. These effects were present in all 24 patients with CF and 10 of 14 parents of CF patients and absent from the serum of 21 control subjects. This quantitative technique provides an alternative to the ciliostatic assays for the detection of the CF factor or factors.

A New Assay for Cystic Fibrosis Factor: Effects of Sera from Patients with Cystic Fibrosis in the in Vitro Electrical Properties of Rat Jejunum