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]:  Long - range mapping by pulse - field gel electrophoresis indicated that the three mdr genes are closely linked on a genomic DNA segment of approximately 625 kilobases .
[A]: mdr genes


[Q]:  By contrast , CIS failed to affect the IL - 9 response .
[A]: IL - 9


[Q]:  The presence of a short ( 70 bp ) intron near the N - terminus of the atX gene was predicted that contains the canonical GT and AG dinucleotides at its 5 ' - and 3 ' - splicing junctions .
[A]:
atX gene