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The MPTA (mesopontine tegmental anesthesia area) is a key node in a network of axonal pathways that collectively engage the key components of general anesthesia: immobility and atonia, analgesia, amnesia and loss-of-consciousness. In this study we have applied double retrograde tracing to analyze MPTA connectivity, with a focus on axon collateralization. Prior tracer studies have shown that collectively,...
General anaesthetic agents induce loss of consciousness coupled with suppression of movement, analgesia and amnesia. Although these diverse functions are mediated by neural structures located in wide‐ranging parts of the neuraxis, anaesthesia can be induced rapidly and reversibly by bilateral microinjection of minute quantities of γ‐aminobutyric acid (GABA)A‐R agonists at a small, focal locus in the...
Cnidarians such as hydrae and sea anemones are sessile, predatory, soft bodied animals which depend on offensive and defensive allomones for prey capture and survival. These allomones are distributed throughout the entire organism both in specialized stinging cells (nematocytes) and in the body tissues. The cnidarian allomonal system is composed of neurotoxins, cytolysins and toxic phospholipapses...
AaIT is a single chain neurotoxic polypeptide derived from the venom of the Buthid scorpion Androctonus australis Hector, composed of 70 amino acids cross-linked by four disulfide bridges. Its strict selectivity for insects has been documented by toxicity, electrophysiological and ligand receptor binding assays. These last have shown that various insect neuronal membranes possess a single class of...
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