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Taq polymerase
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Local ring network
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Phase contrast microscope
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Decarbonation
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Microsatellite
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Accommodation
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Sale by the cord
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Gestagen
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Varicose veins
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Thermocline
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Fair trade
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Lysosome
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Anti-aliasing
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Osteoarthritis
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Ornithologist
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Light microscope
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Eutrophic
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New Technology Telescope
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Canada-France-Hawaii observatory
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Orion nebula
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Charter for the Environment
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Archaeopteryx
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Jerusalem artichoke
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Amniocentesis
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CRT
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Albinism
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Wood pellets
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Exudation
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Indicator species
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iDTV
Group of galaxies
A concentration of galaxies held together by gravitation. The term 'group' usually refers to small concentrations of a few dozen galaxies, while 'cluster' is used for larger concentrations.
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