WWTR1 and alveolar rhabdomyosarcoma: To test whether TAZ protein abundance is associated with clinical outcomes in rhabdomyosarcoma, we immunostained a human rhabdomyosarcoma tissue microarray containing 206 ERMS and 76 ARMS cases for TAZ, using the HPA007415 Sigma antibody, previously used to immunostain breast cancer samples 39, and assessed TAZ levels and location (Figure 1A, C).