Biochemistry Plasma tyrosine level in Richner-Hanhart syndrome is: A 1-2 mg/dL B 2-3 mg/dL C 4-5 mg/dL D 8-10 mg/dL 💡 Explanation Plasma tyrosine level in Richner-Hanhart syndrome is: ✓ Correct Answer: C. 4-5 mg/dL