title: Letter: Bioassays of cystic-fibrosis factor.
mesh_terms: D000293:Adolescent; D000328:Adult; D001681:Biological Assay; D001793:Blood Preservation; D001800:Blood Specimen Collection; D002648:Child; D003550:Cystic Fibrosis / Q000097:blood* / Q000235:genetics; D005260:Female; D006579:Heterozygote; D006801:Humans; D008297:Male