Mice that are homozygous for the targeted mutation are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. No gene product (mRNA) is detected by Northern blot analysis of the dorsal root ganglia. Quantitative autoradiography ligand binding assays of solitary tract nucleus, area postrema and trigenimal nucleus caudalis and electrophysiological tests of isolated nociceptor neurons do not detect functional receptor activity. Mutant mice have an impaired response to persistent pain caused by inflammatory tissue injury. This mutant mouse strain may be useful in studies of nociceptive processing, pain response behavior, and peripheral neurogenic inflammation.

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These <i> Htr3a</i> knock-out mice exhibit an impaired response to persistent pain caused by inflammatory tissue injury.

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