Carboxypeptidase B-like activity and C3 in cystic fibrosis.

Assays of carboxypeptidase B-like activity and C3 in serum from patients with 
cystic fibrosis and appropriate control subjects failed to demonstrate a deficiency 
of carboxypeptidase B-like activity or a consistent increase in C3, as 
was suggested by Conover and associates. Differences between men and women 
with cystic fibrosis were apparent, in that women with cystic fibrosis 
had higher concentrations of both serum carboxypeptidase B-like activity and C3 
than either men with cystic fibrosis or control subjects. 