title: C1q precipitins in human seminal plasma.
abstract: Seminal plasma was tested against purified C1q by double diffusion. Precipitation reactions were frequently observed in the seminal plasma of patients with normozoospermia and patients with azoospermia; most of these reactions were not due to soluble immune complexes binding to C1q. A factor resistant to DNAse and RNAse (mol wt: 25,000--150,000 daltons) was found to precipitate C1q. Its discovery adds to the list of substances which may interfere in C1q precipitation tests.
mesh_terms: D002850:Chromatography, Gel; D003172:Complement C1 / Q000032:analysis*; D003851:Deoxyribonucleases / Q000494:pharmacology; D006801:Humans; D007713:Klinefelter Syndrome / Q000276:immunology; D008297:Male; D009845:Oligospermia / Q000276:immunology; D011234:Precipitins / Q000032:analysis*; D012260:Ribonucleases / Q000494:pharmacology; D012661:Semen / Q000276:immunology*
chemical_list: D003172:Complement C1; D011234:Precipitins; D003851:Deoxyribonucleases; D012260:Ribonucleases