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| Description of islet of Langerhans (noun: plural: islets of Langerhans) groups or islands of cells in the pancreas Samples of islet of Langerhans The islets of Langerhans are the pancreatic areas where glucagon, gastrin and insulin are made.
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| Description of copper (noun: no plural) unreactive metallic element with chemical symbol Cu that is essential for red blood cell formation Samples of copper Copper is an excellent conductor and so is used to make electricity cables.
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| Description of epimer (noun: plural: epimers) molecule differing only in the spatial arrangement around a single carbon atom Samples of epimer Aldose diastereomers differing about the configuration of one carbon are called epimers.
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| Description of trace element (noun: plural: trace elements) element which is present in very small amounts in living things Samples of trace element Iodine and copper are trace elements.
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| Description of substituent (noun: plural: substituents) atom, radical, or group replaced for another in a chemical molecule Samples of substituent Each substituent is apportioned a number to identify its point of attachment to the principal chain of an alkane.
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| Description of smooth muscle (noun: no plural) muscle that produces slow, long-term contractions; found in hollow organs Samples of smooth muscle The stomach, intestines and bladder are lined with smooth muscle.
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| Description of exocrine gland (noun: plural: exocrine glands) a gland that secretes the substances it makes outside of the body Samples of exocrine gland The sudoriparous and the salivary glands are exocrine glands.
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| Description of toxin (noun: plural: toxins) poisonous substance Samples of toxin Bacteria make toxins that cause illness. White blood cells make antitoxins that destroy toxins.
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| Description of onset (noun: plural: onsets) the beginning Samples of onset The onset of menstruation is brought about by hormonal changes.
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| Description of agent (noun: plural: agents) a substance that induces a reaction or effect Samples of agent The chemical agent used to stain.
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