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Molecular Biology and Bioinformatics Glossary

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U

Unitary Matrix

Also known as Identity Matrix. A scoring system in which only identical characters receive a positive score. (NCBI)

Up-and-Down

the simplest topology for a helical bundle or folded leaf, in which consecutive helices are adjacent and antiparallel; it is approximately equivalent to the meander topology of a beta-sheet. (SCOP)

Uracil

A nitrogenous base normally found in RNA but not DNA; uracil is capable of forming a base pair with adenine.
See also: base pair, nucleotide (ORNL)

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