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Cells

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mouse skeleton x-ray

BONE UP  The skeleton doesn’t just protect important bodily organs, it also talks to them, studies in mice show.

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).

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