Part 1. Definition
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.
Part 2. Example
Sox - 4 is important for very early B - cell differentiation , while TCF - 1 / LEF - 1 play a crucial role in early thymocyte development 
Answer: TCF - 1
Explanation: The gene, TCF - 1 has been tagged as protein since it plays a crucial role in early thymocyte development.
Part 3. Exercise
 To directly examine the effect of 1 , 25 - ( OH ) 2D3 on T cell activation in the absence of other complicating interactions , we utilized a panel of cloned Ia - restricted T cell hybridomas that secrete IL 2 on activation by cloned Ia - bearing stimulator cells ( TA3 ) or when stimulated by mitogen .
Answer:
IL 2