The iris of a human eye has two layers of fibers, radial fibers that pry the pupil open and sphincter fibers that snap it shut.
By The Scientist Staff | November 13, 2012
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December 24, 2012
By Kate Yandell
A mass migration of mobile regulatory elements increased the expression of thousands of genes in the uterus during the evolution of pregnancy.
By Ruth Williams
Scientists have determined the crystal structures of bacterial translocator proteins, but their functions remain unclear.
By Jenny Rood
Charles Townes, Nobel Prize-winning physicist, has passed away at age 99.
View the January 2015 contents.
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