Delta Sleep-Inducing Peptide (DSIP) refers to a small protein that causes deed sleep when injected into animals

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Delta waves refer to brain waves with a high amplitude and a frequency of less than 4 cycles per second that are produced during deep sleep

- Delta-9-tetrahydrocannabinol (Delta-9-THC) : Delta-9-tetrahydrocannabinol refers to a chemical found in the leaves of marijuana plants

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- Delta-9–THC (Delta-9-tetrahydrocannabinol) : Delta-9–THC also known as Delta-9-tetrahydrocannabinol is the principal active cannabinoid in marijuana responsible for the psychoactive effects

DeltaFosB refers to a transcription factor, factor that makes DNA, that has been shown to accumulate in areas of the brain associated with addiction, the Nucleus accumbens and the dorsal s

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Delusion refers to the incorrect belief which is out of keeping with the person's cultural context, intelligence and social background and which is held with unshakeable conviction.

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Delusional disorder refers to a psychotic disorder marked by severe delusions of grandeur, jealousy, persecution, or similar preoccupations; a psychotic disorder marked by a single striking psychotic symptom, an oraganized system of fixed, bizarre false belief, and persistent belief contrary to reality (delusion) but no other symptoms of schizophrenia, such as hallucinations, affective flattening, and additional symptoms of a thought disorder.

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delusions refer to disturbances in thinking involving disordered thought content and strong beliefs that are misrepresentations of reality.

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