Detailed Instructions: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Q: In further support of the biological significance of these DNA - protein interactions , the IL2RA oligonucleotide from - 291 to - 245 proved to be sufficient in either orientation to confer PMA inducibility to the mitogen - insensitive thymidine kinase gene promoter in Jurkat cells .
A:
thymidine kinase