ANO1 also named as DOG1, ORAOV2, TAOS2 and TMEM16A, acts as a calcium-activated chloride channel. It is required for normal tracheal development. ANO1(or DOG1) is used as an aid in the identification and diagnosis of gastrointestinal stromal tumors(GIST) within the context of an antibody panel, the patient s clinical history, and other diagnostic tests evaluated by a qualified pathologist. The immunogen is the C-terminal of ANO1. This antibody can recognize isoform1 and isoform2 of human ANO1.