A testis-specific gene, TPTE, encodes a putative transmembrane tyrosine phosphatase and maps to the pericentromeric region of human chromosomes 21 and 13, and to chromosomes 15, 22, and Y.
Chen H, Rossier C, Morris MA, Scott HS, Gos A, Bairoch A, Antonarakis SE. Hum Genet. 1999 Nov; 105(5):399-409.