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.

Example input: Sox - 4 is important for very early B - cell differentiation , while TCF - 1 / LEF - 1 play a crucial role in early thymocyte development
Example output: TCF - 1
Example explanation: The gene, TCF - 1 has been tagged as protein since it plays a crucial role in early thymocyte development.
Q: Biochemical studies have identified a cellular non - P element - encoded DNA binding protein , termed the inverted repeat binding protein ( IRBP ) , that specifically interacts with the outer half of the 31 - bp terminal inverted repeats .
A:
P element