
1) Amino acid 2) Toxic amino acid
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https://www.crosswordclues.com/clue/kainic-acid

Kainic acid (kainate) is a natural marine acid present in some seaweed. Kainic acid is a potent neuroexcitatory amino acid that acts by activating glutamate, the principal excitatory neurotransmitter in the central nervous system. Glutamate is produced by the cell’s metabolic processes and there are four major classifications of glutamate recept...
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http://en.wikipedia.org/wiki/Kainic_acid

Synonym for kainate ... An agonist for the K type excitatory amino acid receptor. It can act as an excitotoxin producing symptoms similar to those of Huntingdon's chorea and is also used as an anthelminthic drug. Originally isolated from the alga Digenea simplex. The receptor is an amino acid gated ion channel, one of several types gated by the tra...
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http://www.encyclo.co.uk/local/20973

See kainate.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: kā-in′ik as′id Definitions: 1. A glutamate analogue that exhibits powerful and long-acting excitatory and toxic activity on neurons. In neurobiology, it is used as a research tool to destroy neurons and as an activator of glutamate receptors; it has been used as an anthelmintic against nematodes. &...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=46627

an analogue of glutamate, CHNO, derived from the red alga Digenia simplex, used experimentally to stimulate certain neurons in the brain.
Found on
https://www.infoplease.com/dictionary/kainic-acid
No exact match found.