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Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
Endothelial cells under the microscope.
Muscle fibers consist of single, elongated, multinucleated cells that arise from the fusion
Glucagon- and insulin-secreting cells in the islets of Langerhans
Activity of Cytotoxic T Cells
Opener Colored scanning electron micrograph of two prostate cancer cells in the final stages of cell