TATA Box

A consensus sequence found in the promoter region of most genes transcribed by eukaryotic RNA polymerase II. It is found about 25 nucleotides before the site of initiation of transcription and has the consensus sequence: 5' TATAAAA 3'. This sequence seems to be important in determining accurately the position at which transcription is initiated. (NCI Thesaurus)

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TAT Protein

A nucleolar, HIV-encoded transcriptional regulator that binds to the RNA Trans-Activating Responsive (TAR) sequence. TAT activates transcription initiation and/or elongation from the…

TAT Gene

DNA sequences that form the coding region for the protein responsible for trans-activation of transcription (tat) in human immunodeficiency virus (HIV). …

Taste Transduction Pathway

All taste pathways are proposed to converge on common elements that mediate a rise in intracellular Ca2+ followed by neurotransmitter release. Na+…

Taste Pore

The opening at the apex of the taste bud.

Taste Bud Cell

Any of the three types of the cells that constitute the taste bud. They are classified as neuroepithelial (sensory) cells, supporting cells,…

Taste Bud Basal Cell

A small, round cell found in the lower part of the epidermis of the taste bud. It differentiates into a new receptor…