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The haemodynamic alterations induced by the central and peripheral administration of the armed spider (Phoneutria nigriventer) venom (PNV) were investigated in anaesthetised rabbits. The intracerebroventricular injection of increasing doses of PNV (30 and 100 μg/kg) elicited a biphasic cardiovascular response characterised by a brief hypotension (1-3 min) followed by a marked and sustained (more than...
From a Phoneutria nigriventer venom gland cDNA library several clones coding for the insect specific neurotoxin Tx4(6-1) were isolated. cDNA analysis showed that the encoded protein contained three distinct segments, comprising a signal sequence of 16 amino acids, followed by a glutamate-rich sequence of 18 amino acids and, finally, the coding region for the mature toxin. The deduced amino acid sequence...
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