Expressed in numerous tissues; not found in breast, heart, small intestine and liver (PubMed:12036297). Isoform 1: Predominantly expressed in the testis (PubMed:11920614, PubMed:15472897). Isoform 3: Predominantly expressed in the testis, at lower level in the placenta, during malignant progression of melanocytic tumors and in several tumors of varying origins (PubMed:11920614, PubMed:15472897). Isoform 4: Predominantly expressed in the testis, at lower level in the placenta, during malignant progression of melanocytic tumors and in several tumors of varying origins (PubMed:11920614, PubMed:15472897). Isoform 5: Predominantly expressed in the testis (PubMed:11920614, PubMed:15472897). Isoform 6: Predominantly expressed in the testis (PubMed:11920614, PubMed:15472897). Potential cancer-testis antigen, with expression restricted to the testis and certain malignant cells. Predominantly expressed in the testis. Predominantly expressed in the testis, at lower level in the placenta, during malignant progression of melanocytic tumors and in several tumors of varying origins. Predominantly expressed in the testis, at lower level in the placenta, during malignant progression of melanocytic tumors and in several tumors of varying origins. Predominantly expressed in the testis. Predominantly expressed in the testis.