In the peripheral blood of pregnant women carrying fetuses with trisomy 21 (Down syndrome) we report that the protein Serum amyloid P-component (SAP, SAMP, SwissProt No: P02473) appears quantitative and/or qualitative differences compared to the peripheral blood of women carrying chromosomally normal fetus. Thus, that protein could be a target and used as marker for the pranatal prognosis and/or diagnosis of Trisomy 21 (Down syndrome) with non-invasive techniques or methods.
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