tapetoretinal degeneration degeneration of the pigmented layer of the retina. transneuronal degeneration atrophy of certain neurons after interruption of afferent axons or death of other neurons to which they send their efferent output.apetoretinal degeneration degeneration of the pigmented layer of the retina. transneuronal degeneration atrophy of certain neurons after interruption of afferent axons or death of other neurons to which they send their efferent output.
How accurate is the DNA Originsâ¢ test? The DNA Originsâ¢ test provides your ancestral proportions based on years of collaborative research of populations representing 4 ancestral groups. This research identified 144 informative markers in our DNA, called Ancestry Informative Markers (AIMs).
Advances in DNA testing are allowing people to uncover information about their genetic ancestry and find out where some of their ancestors came from. As an African American, I donât know where my African ancestors originated from. The only geographic location I can point to as my ancestral home is Tennessee. So Iâm fascinated by the potential knowledge I could gain from this new generation of tests for genetic ancestry. But before I fork over more than $200 for such a test, the skeptic in me needs some answers.