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In page MTA2:

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MTA2 was initially recognized as an MTA1 like 1 gene, named MTA1-L1, from a large scale sequencing of randomly selected clones from human cDNA libraries in 1999.[1] Clues about the role of MTA2 in gene expression came from the association of MTA2 polypeptides in the NuRD complex in a proteomic study[2] This was followed by targeted cloning of murine Mta2 in 2001.[3]