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Cells

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Germline stem cells

EGG-CITING DEVELOPMENT  Germline stem cells (orange circles, left) implanted into a mouse’s ovary move to the edge of the ovary (middle) and begin developing into eggs. By day 6 (right) the cells began making a protein called STRA8 (pointed out with red arrow), one sign that they were starting to turn into eggs.

neutrophils

ON TRACK  Neutrophils (red) crawl along the walls of capillaries in a mouse lung (tracks shown in blue). In mice deficient in a key protein, these immune cells couldn’t move as far (left) as those in mice that had the protein (right).

macrophages and heart cells

IT’S ELECTRIFYING  Macrophages (green) “plug in” to heart cells (light purple and pink), providing an electrical boost that helps the heart cells contract and pump blood, a study in mice finds.

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