Molecular markers show structures and cell types within a human embryo, shown here 12 days after fertilization. The epiblast, for example, appears in green. Gist Croft, Alessia Deglincerti, and Ali H. Brivanlou/The Rockefeller University hide caption

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Advance In Human Embryo Research Rekindles Ethical Debate
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Earlier this week, NIH temporarily halted work in the cell therapy lab of Dr. Steven Rosenberg, chief of surgery at the National Cancer Institute, pending a review of safety standards there. Courtesy of National Cancer Institute hide caption

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Task Force Calls For More Safety Oversight At NIH Research Hospital
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The Clinical Center on the campus of the National Institutes of Health, in Bethesda, Md., is an internationally renowned hospital where patients are also research subjects. NIH/Flickr hide caption

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A health worker in Lima, Peru, fumigates against the mosquito that spreads Zika virus, dengue and chikungunya. Martin Mejia/AP hide caption

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How Scientists Misread The Threat Of Zika Virus
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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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Virus Profilers Race To Figure Out What Makes Zika Tick
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Neil Tony/Getty Images/Ikon Images
Clinical Trials Still Don't Reflect The Diversity Of America
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A surgical team at Sooam Biotech in Seoul, South Korea, injects cloned embryos into the uterus of an anesthetized dog. Rob Stein/NPR hide caption

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Disgraced Scientist Clones Dogs, And Critics Question His Intent
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Costs Of Slipshod Research Methods May Be In The Billions
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Marder says immunotherapy has side effects but is less tiring than chemotherapy. Claire Eggers/NPR hide caption

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Harnessing The Immune System To Fight Cancer
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Scientists reprogrammed the common bacterium E. coli so it requires a synthetic amino acid to live. BSIP/UIG via Getty Images hide caption

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Scientists Give Genetically Modified Organisms A Safety Switch
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David Goldhill (second from left) talks with Dan Hilferty of Independence Blue Cross, Kevin Nazemi of Oscar Insurance and Sam Nussbaum of WellPoint in a conversation about health costs. Moderator Avik Roy is at far left. Glen Davis/Forbes hide caption

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The new microscopy technique (lower right) brings into focus details of cell structures never seen before with light. Courtesy of A. Honigmann, C. Eggeling and S.W. Hell, MPI Göttinge hide caption

toggle caption Courtesy of A. Honigmann, C. Eggeling and S.W. Hell, MPI Göttinge