Embryologist Bernadette de Bakker and colleagues at the Academic Medical Center in Amsterdam created the atlas to help students,
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, doctors and researchers better understand what goes on in those earliest weeks.
“We might know more about the moon than about our own development,” de Bakker says. Even today,
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, human embryology textbooks often rely on pictures of chick or mouse embryos to describe how humans grow. Any human embryonic data used “is often based on just one or two specimens,
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,” she says.
And that’s a problem because,
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, as de Bakker has discovered, not all human embryos are the same.
Her team photographed nearly 15,000 cross sections of human embryos from the Carnegie Collection,
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, a famous set of historical specimens collected from hysterectomies and abnormal pregnancies or miscarriages. De Bakker and colleagues uploaded the photos into a computer program, and then, using digital pencils and drawing pads,
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, traced and labeled every organ and structure in every photo. It took some 75 people roughly 45,
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,000 hours to complete.
What they (and we) have gained is a remarkable look at humans’ first metaphorical steps — the steady developmental march that,
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, eventually, takes an embryo from a bundle of cells to babyhood.

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DENVER — Some of the world’s tiniest competitors have gone head–to-head for the first time to decide what holds the title of World’s Fastest Cell,
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.

The competition was born last year at the annual meeting of the American Society for Cell Biology,
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, when Manuel Théry of the Institute for Research in Science and Technology for Living (iRTSV) in Grenoble,
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, France, noticed how many different types of scientists were talking about cell movement. Researchers interested in cancer, developmental biology and cells’ internal skeletons all presented work on how cells move around the body. “In every session people were talking about cell migration,
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,” Théry said.

He and Ana-Maria Lennon-Duménil and Matthieu Piel, both of the Curie Institute in Paris,
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, wanted to know how different types of mobile cells would stack up against each other. The trio decided to hold a race to find out.

Scientists from all over the world sent cells to one of six labs to compete. At the six race centers, volunteers made movies of the cells crawling along 400

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