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Induration
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Materialisation
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Bifid
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Acini
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SNA
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Metamaterials
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Apathy
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CNT
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Amoeba
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Teraflops
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Motor neurone
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Iridescence
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Spinel structure
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Catalytic site
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Endosymbiosis
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Sponge
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Histamine antagonist
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Marginal basin
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Java
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Multiprocessing
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PostgreSQL
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Diplegia
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Downy oak
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Lewis acid
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Oxidising agent
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Natural regeneration
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Heavy mud
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Heliosphere
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Minamata Bay Disaster
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Reverse genetics
Shell
A shell is a hard, calcareous envelope that constitutes the external skeleton of most molluscs and brachiopods.
In birds: External calcified egg shell.
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