Cystic Fibrosis: Characterization of the Inhibitor to Ciliary Action in Oyster Gills

Abstract
The inhibitor to oyster ciliary activity was isolated from serum of cystic fibrosis patients and heterozygotes. The inhibiting protein fraction was a cation as judged by electrophoresis; it had a molecular weight of 125,000 to 200,000 as judged by gel filtration; and on diethylaminoethyl-cellulose chromatography it eluted with the immunoglobulin G fraction. The analogous fraction in normal individuals did not inhibit oyster cillary activity.