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Maspin
Maspin (mammary serine protease inhibitor) is a protein that in humans is encoded by the ''SERPINB5'' gene. This protein belongs to the serpin (serine protease inhibitor) superfamily.〔 ''SERPINB5'' was originally reported to function as a tumor suppressor gene in epithelial cells, suppressing the ability of cancer cells to invade and metastasize to other tissues. Furthermore, and consistent with an important biological function, Maspin knockout mice were reported to be non-viable, dying in early embryogenesis. However, a subsequent study using viral transduction as a method of gene transfer (rather than single cell cloning) was not able to reproduce the original findings and found no role for maspin in tumour biology. Furthermore, the latter study demonstrated that maspin knockout mice are viable and display no obvious phenotype.〔 These data are consistent with the observation that maspin is not expressed in early embryogenesis.〔 The precise molecular function of maspin is thus currently unknown.
== Tissue distribution ==
Maspin is expressed in the skin, prostate, testis, intestine, tongue, lung, and the thymus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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