| transport protein |
a protein that binds to a substance and provides a transport system for it, either in the plasma or across a plasma membrane (see facilitated diffusion, under diffusion). Some are specific for one substance, such as a hormone, and others bind to several different substances. The term is sometimes used specifically for proteins that bind other proteins. Called also carrier, translocase, and transporter.
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| transfer RNA |
small RNA molecules, 73?3 nucleotides, occurring in cells in 20 or more varieties and functioning in translation; each variety carries a specific amino acid to a site specified by an RNA codon, binding to amino acid, ribosome, and to the codon via an anticodon region. All have numerous modified bases and extensive secondary structure; see also illustration.
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| transthoracic pacemaker |
an external cardiac pacemaker delivering stimuli through the chest wall, such as one connected to the heart by percutaneous pacing wires introduced through a transthoracic needle or one in which large electrodes are placed on the skin over the heart.
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| translumbar aortography |
radiography of the aorta after injection of a radiopaque medium into it through a needle inserted into the lumbar area at about the level of the 12th thoracic vertebra.
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| transverse |
f. costalis transversi.
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