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A partial cDNA clone encoding the porcine proteasome subunit A4 (PSMA4 or proteasome subunit C9) has been isolated from a porcine muscle cDNA library and sequenced. A biallelic TaqI RFLP was identified in Large White, Landrace and Duroc breeds. Moreover, the 3′-untranslated region of the gene showed a triallelic SSCP. By linkage analysis the PSMA4 locus was assigned to pig chromosome 7 and by radioactive in situ hybridization this locus was mapped to the region 7q13-q14.