selective injection

se·lec·tive in·jec·tion

injection of contrast medium following selective catheterization of a branch artery or vein for angiography.
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Because they are smaller than the size of a single cell, the nanotubes can provide for the highly selective injection of drugs into individual cells.
The '929 patent relates to the method and apparatus for selective injection of poultry eggs.
Gaumburd RS: The use of selective injections in the lumbar spine.

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