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In mammals, four tropomyosin genes TPM1, TPM2, TPM3, and TPM4 are known. One isoform of the TPM3 gene, encoding 285 amino acid residues designated as TPM3α, has been reported. TPM3α protein expression in human hearts is not definitively established. We have cloned from human heart and skeletal muscle transcripts of TPM3α and three novel TPM3 isoforms, TPM3ν, TPM3ξ, and TPM3ο. TPM3ν and TPM3ο are alternatively...