Bartels, I Maternal levels of pregnancy-specific beta 1-glycoprotein (SP-1) are elevated in pregnancies affected by Down's syndrome. [electronic resource] - Human genetics Sep 1988 - 46-8 p. digital Publication Type: Journal Article ISSN: 0340-6717 Standard No.: 10.1007/BF00451454 doi Subjects--Topical Terms: Amniotic Fluid--analysisDown Syndrome--bloodFemaleHumansPregnancy--bloodPregnancy Proteins--analysisPregnancy-Specific beta 1-Glycoproteins--analysisPrenatal Diagnosis