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Osteoclast differentiation and function in aquaglyceroporin AQP9‐null mice

Background information. Osteoclasts are cells specialized for bone resorption and play important roles in bone growth and calcium homoeostasis. Differentiation of osteoclasts involves fusion of bone marrow macrophage mononuclear precursors in response to extracellular signals. A dramatic increase in osteoclast cell volume occurs during osteoclast biogenesis and is believed to be mediated by AQP9 (aquaporin 9), a membrane protein that can rapidly transport water and other small neutral solutes across cell membranes.