Demonstration of a factor in the serum of homozygotes and heterozygotes for cystic fibrosis by a non-biological technique.

A factor has been isolated from serum of homozygotes and obligate heterozygotes 
for cystic fibrosis using isoelectric focusing and disc electrophoresis as analytical 
methods. The factor is focused within an IgG-fraction with an isoelectric 
point of pH 8 to 9 but differs from IgG in 
its lower molecular weight. It is thus similar to, if not 
identical with, the ciliary dyskinesia factor. 