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Several malignant melanomas, lung, cervical, breast and colorectal cancers displayed weak to moderate nuclear immunoreactivity. Most skin cancers showed moderate to strong nuclear and/or cytoplasmic staining. Smooth muscle cells in tumor stroma was distinctly stained. Remaining malignant cells were negative.
The protein encoded by this gene belongs to the actin family of proteins, which are highly conserved proteins that play a role in cell motility, structure and integrity. Alpha, beta and gamma actin isoforms have been identified, with alpha actins being a major constituent of the contractile apparatus, while beta and gamma actins are involved in the regulation of cell motility. This actin is an alpha actin that is found in skeletal muscle. Defects in this gene cause aortic aneurysm familial thoracic type 6. Multiple alternatively spliced variants, encoding the same protein, have been identified. [provided by RefSeq, Nov 2008]