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frozen |
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frozen /fro·zen/ (fro´zen) 1. turned into, covered by, or surrounded by ice. 2. very cold. 3. stiff or immobile, or rendered immobile. frozen said of material kept at less than 0°C. Biological materials are frozen solid because of their high water content. frozen embryo see embryo transfer. frozen meat meat preserved at low temperatures in a freezer. frozen section a specimen of tissue that has been quick-frozen, cut by microtome, and stained immediately for rapid diagnosis of possible malignant lesions. A specimen processed in this manner is not satisfactory for detailed study of the cells, but it is valuable because it is quick and gives the surgeon immediate information regarding the malignancy of a piece of tissue. frozen semen see semen. |
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In effect, their decision will let their surplus embryos die a slow death, for, unlike stem cells, frozen embryos are not immortal. Today, unused frozen embryos are donated to "research" resulting in their destruction, or they are simply discarded. They had been adopted as frozen embryos and implanted in the wombs of their new mothers, who had brought them to term. |
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frozen embryo
