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Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.
"We, including scientists, have considered ourselves as sort of the pinnacle of evolution," noted lead researcher Bruce Lahn, a University of Chicago geneticist whose studies appear in Friday's edition of the journal Science.Lahn and colleagues examined two genes, named microcephalin and ASPM, that are connected to brain size.If those genes don't work, babies are born with severely small brains, called microcephaly.According to the CDC, there are over 65 million Americans currently living with an STD and an estimated 200-400 million worldwide, 19 million new STD infections each year, one in three sexually active men and women living with Herpes, and about 50% of all sexually active Americans affected by HPV. Finding your Herpes Dating match when you have Herpes can be easier than you think.Positive is a community for people with STDs, where they can find friendship, support, and love!
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Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time.