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Review Question - QID 215152

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QID 215152 (Type "215152" in App Search)
A researcher is studying elderly patients with osteoporosis in order to discover whether there are cellular signaling factors that can explain the decrease in bone mass seen in these patients. She focuses on a cell culture model that is derived from a normal cellular component of bone. Specifically, these cells are normally embedded in the bone matrix and secrete factors that regulate the activity of multiple other cell types. In vivo, these cells do not progress through the cell cycle and have contact points with adjacent cells through small peripheral processes. Based on these features, which of the following is the most likely source of the researcher's cell line?