GAITHERSBURG, Md., Dec. 22 -- A novel combination of microscopes can peer deep into tissue-engineering scaffolds and monitor the growth and differentiation of cells ultimately intended to develop into implantable organs or other body-part replacements, say scientists at the National Institute of Standards and Technology (NIST). NIST scientist Joy Dunkers and her colleagues paired an optical coherence microscope -- a high-resolution probe of the scaffold interior -- with a confocal fluorescence microscope, used to track cells stained with a fluorescent dye. 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