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Penstemon barbatus flowering in the Apache-Sitgreaves National Forest, Arizona.
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Genetic Differences Determine Whether Flowers Are Pollinated by Bees or Hummingbirds

Large differences in flower characteristics between wildflowers with different pollinators are achieved by a few key genetic differences, according to a new study.
White pills on a blue background.
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Patients Still Prefer Daily Oral PrEP Even With the Development of New Options

When PrEP (pre-exposure prophylaxis), a drug that prevents HIV infection, was first approved by the FDA in 2012, it was a medical breakthrough. A new study explores patient preference for the standard method and new options.
Kupffer cell–like clusters (right) assume the function of Kupffer cells (left).
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Giant Immune Cells Step in When Liver Function Is Impaired

A team of researchers has uncovered a previously unknown compensatory mechanism found in liver disease. If Kupffer cells (KCs) become impaired by tissue scarring, immune cells originating in the bone marrow flow to the organ.
A picture taken from within the of the mouth of a cave, looking out to sea.
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Microplastics Found in Cave Closed to Visitors for 30 Years

Researchers in Missouri have found high concentrations of microplastic in Cliff Cave, a cave system in Saint Louis County that has been closed off to visitors for the past 30 years. The extent of the microplastic contamination is detailed in two new research papers, published in Science of the Total Environment and Water Research.
Tundra near the Ny-Ålesund village in the summer of 2019.
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Crucial Role of Biological Particles in the Formation of Ice Within the Arctic Cloud

A team of scientists have presented research findings that reveal a crucial role of biological particles, including pollen, spores, and bacteria, in the formation of ice within Arctic clouds.
A cluster of rod-shaped TB bacteria.
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Tweaking the Immune System To Help It Fight TB

Researchers have identified a way to tweak the immune system, transforming TB-susceptible macrophages into resilient ones to help fight the disease.
LED battery outline.
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Recycled Batteries Hold Valuable Metals

Demand for valuable metals needed in batteries is poised to grow over the coming decades in step with the growth of clean energy technologies, and the best place to source them may be by recycling spent batteries.
A grid of twelve cryo-EM images, on with the protein structure show in color.
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Key Improvement to Cryo-EM Developed

A protein scaffold that holds smaller proteins in place has enhanced cryo-EM, enabling the high-quality visualization of small molecules.
A rendering of the human intestines.
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Novel Human Stomach Microphysiological System Created

A human stomach microphysiological system has been created, which could lead to progress in understanding and treating gastrointestinal diseases, including stomach cancer.
Stem cells.
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Fitness of Cells Used in Cell Transplants Improved

Researchers found exposing cells to a small molecule drug improved their fitness during hematopoietic stem cell transplants, which could broaden access and improve outcomes for ex vivo gene therapy.
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