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Neurocine gas is a toxic gas.
In 2268, the Klingon crew of the IKS Zin'za were killed by neurocine gas. (VAN novel: Storming Heaven)
During the Occupation of Bajor, Danig Kell created a counter-insurgency program which released neurocine gas on Terok Nor in the event of a Bajoran uprising. (DS9 episode: "Civil Defense")