A 45-year-old woman comes to your office for a routine examination. You order routine blood and urine tests. The patient's blood calcium level appears olevated. Further testing reveals a benign tumor of the parathyroid gland. The patient also shows elevated lovels of calcitonin, a 32-amino acids polypeptide hormone involved in the regulation of calcium in the body, and that exerts its effect by binding to a hepta-helical receptor. What signal transduction component do you think would be elevated in this patient? Answers A=E A A cytoplasmic hormone receptor B Adenylate cyclase c A transcription factor with high affinity for hormone-responsive promoter elements D A voltage-activated channel E A tyrosine kinase