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T
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Tandem repeat sequences
- Multiple copies of the same base sequence on a chromosome; used as markers in physical mapping.
See also:
physical map
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Taper needle (synonyms: non cutting, atraumatic, round)
- The body of this needle tapers down to a fine point, permitting minimum tissue damage. This needle is especially suitable for soft tissue.
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See also:
needles
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Targeted mutagenesis
- Deliberate change in the genetic structure directed at a specific site on the chromosome. Used in research to determine the targeted region's function.
See also:
mutation, polymorphism
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Technology transfer
- The process of transferring scientific findings from research laboratories to the commercial sector.
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Telomerase
- The enzyme that directs the replication of telomeres.
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Telomere
- The end of a chromosome. This specialized structure is involved in the replication and stability of linear DNA molecules.
See also:
DNA replication
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Teratogenic
- Substances such as chemicals or radiation that cause abnormal development of a embryo.
See also:
mutatgen
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Thymine (T)
A nitrogenous base, one member of the base pair AT (adenine-thymine).
It is one of the four bases in DNA that make up the letters ATGC, thymine is the
"T". The others are adenine, guanine, and cytosine. Thymine always pairs
with adenine.
See also:
base pair, nucleotide
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Toxicogenomics
- The study of how genomes respond to environmental stressors or toxicants. Combines genome-wide mRNA expression profiling with protein expression patterns using bioinformatics to understand the role of gene-environment interactions in disease and dysfunction.
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Transcription
- The synthesis of an RNA copy from a sequence of DNA (a gene); the first step in gene expression.
It is The process by which RNA polymerase assembles an RNA molecule
complementary to the template strand (antisense) of the DNA. The product
may be messenger RNA, transfer RNA or ribosomal RNA.
See also:
translation
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Transcription factor
- A protein that binds to regulatory regions and helps control gene expression.
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Transcriptome
- The full complement of activated genes, mRNAs, or transcripts in a particular tissue at a particular time
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Transfection
- The introduction of foreign DNA into a host cell.
See also:
cloning vector, gene therapy
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Transfer RNA (tRNA)
- A class of RNA having structures with triplet nucleotide sequences that are complementary to the triplet nucleotide coding sequences of mRNA. The role of tRNAs in protein synthesis is to bond with amino acids and transfer them to the ribosomes, where proteins are assembled according to the genetic code carried by mRNA.
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Transformation
- A process by which the genetic material carried by an individual cell is altered by incorporation of exogenous DNA into its genome.
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Transgenic
- An experimentally produced organism in which DNA has been artificially introduced and incorporated into the organism's germ line.
See also:
cell, DNA, gene, nucleus, germ line
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Translation
- The process by which messenger RNA directs a ribosome to assemble a
polypeptide. As specified in the genetic code each codon in the mRNA
corresponds to an amino acid. The assembly of the protein stops when the
ribosome encounters one of three possible stop codons.
See also:
transcription
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Translocation
- A mutation in which a large segment of one chromosome breaks off and attaches to another chromosome.
See also:
mutation
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Transposable element
- A class of DNA sequences that can move from one chromosomal site to another.
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Trisomy
- Possessing three copies of a particular chromosome instead of the normal two copies.
See also:
cell, gene, gene expression, chromosome
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