methyl group

noun Chemistry.
the univalent group CH 3 −, derived from methane.
Also called methyl radical.
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Encyclopedia Britannica
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methyl group

one of the commonest structural units of organic compounds, consisting of three hydrogen atoms bonded to a carbon atom, which is linked to the remainder of the molecule. The methyl radical (CH3), the methyl cation (CH+3), and the methyl anion (CH-3)34 are transient intermediates in many chemical reactions.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Many proteins in plant cells are modified by the addition of an isoprenoid tail and a terminal methyl group.
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