- The mouse homolog of the Wiskott-Aldrich syndrome protein (WASP) gene is highly conserved and maps near the scurfy (sf) mutation on the X chromosome. Derry, J.M., Wiedemann, P., Blair, P., Wang, Y., Kerns, J.A., Lemahieu, V., Godfrey, V.L., Wilkinson, J.E., Francke, U. Genomics (1995)