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A digital illustration of light green rod-shaped bacteria floating in front of an uneven dark green surface suggestive of the gut lining. A digital illustration showing a strand of DNA (red and blue) wrapped around histone proteins (gray). The DNA strand comprising each chromosome is tightly packed into clusters of wrapped histones to compress the long molecule and streamline separation of copied chromosomes during cell replication. The strand is carefully unwound by different enzymes, including TIP60, to make it accessible for duplication and gene expression. (Credit:Wirestock Creators/Shutterstock) Jen Wacker processes a sample of actinium at Berkeley Lab. A person in a navy top standing with their arms crossed in front of a hallway. Close up of ashtray full of cigarettes with a person in background working on a laptop computer. The elements cadmium, arsenic, and chromium are overlaid on top. Two black and white profile pictures of a female scientist and a male scientist on a green gradient background Abstract digital illustration of bacteriophages against a purple background. Futuristic image of an immune system protecting from infectious diseases with a glowing low polygonal shield, coronavirus and bacteria cells on dark blue background. A cartoon-like graphic showing multicolored microbes and viruses on a dark blue background. A searchlight tracks over the microbes, revealing a section of colorful DNA inside a bacterium. Hand holding a cigarette near carpet. An artistic rendering of lipid nanoparticles showing multiple layers that take on different molecular arrangements, giving the particle varying properties. Eva Nogales, a person with medium-length white hair wearing glasses and a dark jacket over a white collared top, photographed outdoors with trees in the background.