Which of the following components that are essential for rearrangement of the IgH and IgL loci are not utilized in rearrangement of the TCR loci?
A. RAG-1/2
B. Artemis
C. TdT
D. RSS sequences with spacers of 12 bp and 23 bp
E. All of the above are essential for rearrangement of the TCR loci
Answer: E