A 32-years old male with suspected neurofibroma, tosis was found to have a blood pressure of 178/110 mm Hg at a recent health fair. He complained of palpitations and excessive sweating. Today he presents to the clinic for a checkup because he has developed abdominal discomfo. His blood pressure is now recorded to be 130/80 mm Hg. Physical examination reveals multiple tumors of the oral mucosa and skin. Laboratory investigations reveal: Serum K+ : 3.8 mEq/L (N : 3.5-5.0 mEq/L) Serum Ca2+: 136 mEq/L (N : 135-145 mEq/I,) Serum Ca2+ : 9.4 mg/dL (N : 8.4-10.2 mg/dL) d 14) Genetic studies in this patient will most likely show -