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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.With the macro- and micro-imaging technologies described here, essentially any in vivo process can be imaged, giving rise to the new field of in vivo cell biology using fluorescent proteins.‘...during periods of revolution when the fundamental tenets of a field are once more at issue, doubts are repeatedly expressed about the possibility of continued progress if one or another of the opposed paradigms is adopted.’Thomas S.High-resolution images are captured directly on a PC (Fujitsu Siemens, Munich, Germany).A variable-magnification small animals imaging system (OV100, Olympus Corp., Tokyo, Japan), containing an MT-20 light source (Olympus Biosystems, Planegg, Germany) and DP70 CCD camera (Olympus), can be used for macro- and subcellular imaging in live mice.The OV100 contains an MT-20 light source (Olympus) and DP70 CCD camera (Olympus).The optics of the OV-100 fluorescence imaging system have been specially developed for macroimaging as well as microimaging with high light-gathering capacity.In vivo images can even be acquired with a cell phone camera because fluorescent proteins are so bright!

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The optics and antireflective coatings ensure optimal imaging of multiplexed fluorescent reporters in small animals.Multicolored proteins have allowed the color-coding of cancer cells growing in vivo and enabled the distinction of host from tumor with single-cell resolution in vivo.Fluorescent proteins of many different colors have now been characterized and these can be used to color-code cancer cells of a specific genotype or phenotype.Non-invasive imaging of cancer cells expressing fluorescent proteins has allowed the real-time determination of efficacy of candidate antitumor and antimetastatic agents in mouse 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 and extravasation.

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