we evaluated four methods purported to distinguish between individuals homozygous or heterozygous for cystic fibrosis ( cf ) and normal controls : ( 1 ) detection of a protein in the serum by isoelectric focusing at ph 8.5 , ( 2 ) detection of a lectinlike factor in the serum by hemagglutination , ( 3 ) isolation of cf-lectin from the serum by affinity chromatography , and ( 4 ) measurement of mugb-reactive proteases in the plasma .
C0229671
serum
C0032105
plasma