Dennis Lo led a working group in 1997 that fetal DNA can be detected in maternal blood can be detected very early during pregnancy at the presence of Y chromosome marker. Their findings have since been replicated many times by different research teams, in different stages of pregnancy. They used a large number of DNA markers, and techniques, and a number of examples of types.
In a group of sufficiently motivated to sufficiently motivated to participate in a program like this , a 43 percent drop-out rate is surprising. The authors identify the factors that predict turnover for program for program improvement and further of the research. . Continue reading “Their findings have since been replicated many times by different research teams.”