DNA sequencing reveals that the virus responsible for the recent outbreak in the Americas originated in Brazil in 2014 and circulated undetected for months before the first cases were reported.
Researchers have discovered a conserved mechanism among vertebrates that determines body segment number, according to a study published online in Nature today (June 18). The number of body segments an organism has varies greatly between species: our vertebrae, a measly thirty-three in number, hardly stack up to the 300-plus in our slithering co-vertebrates. But anatomists and embryologists have puzzled over a mechanism to explain the difference. "
June 18, 2008|
June 18, 2008