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Fluorescent Proteins as Sensors for Cellular Behavior in Mice.

Imaging of cancer cells in mice expressing fluorescent proteins has allowed the real-time tracing of cancer growth and metastasis and determination of efficacy of candidate antitumor and antimetastatic agents, especially in mouse orthotopic models. The use of fluorescent proteins to differentially label cancer cells in the nucleus and cytoplasm can visualize the nuclear-cytoplasmic dynamics of cancer cells in vivo, including mitosis, apoptosis, cell-cycle position, and differential behavior of nucleus and cytoplasm that occurs during cancer cell deformation, migration, and extravasation. Recent applications of the technology described here include linking fluorescent proteins with cell cycle-specific proteins such that the cells change color from red to green as they transit from G1 to S phases. Any in vivo process can be imaged using fluorescent proteins, allowing molecular biology to advance from in vitro studies to studying molecular processes in the living animal.

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