| http://www.w3.org/ns/prov#value | - Unlike a procedure unveiled last month, the one announced Wednesday in the journal Nature can be done without knowing who the father is, much less obtaining a sample of his DNA. Since paternity is unknown or incorrect in an estimated 3 to 10 percent of births in the United States, the father-free method promises to make fetal DNA sequencing possible in every pregnancy, if hurdles including cost an
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