This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which amino acid does not take part in transamination 
Select and explain. 
A. Proline, B. Alanine, C. Tryptophan, D. Histidine
A: Proline
Answer: A: Proline 
Explanation: All amino acids can take part in transamination except:
a) Threonine b) Lysine c) Proline