sentence: Dual-specificity phosphatase-1 ( DUSP1 ) , also known as MAP kinase phosphatase1 ( MKP1 ) , human VH1 phosphatase homolog ( HVH1 ) or protein tyrosine phosphatase non receptor 10 ( PTPN10 ) , belongs to a family of phosphatases with dual specificity for threonine and tyrosine , which was first found in cultured murine cells [ 138 ] .