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  1. Prefix (in italics) denoting across, through, beyond; opposite of cis-.
  2. In genetics, a prefix denoting the location of two genes on opposite chromosomes of a homologous pair.
  3. In organic chemistry (in italics), a form of geometric isomerism in which the atoms attached to two carbon atoms, joined by double bonds, are located on opposite sides of the molecule.
  4. In biochemistry, a prefix to a group name in an enzyme name or a reaction denoting transfer of that group from one compound to another; transformylase (transfers a formyl group), transpeptidation.

[L. trans, through, across]

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