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: Sox - 4 is important for very early B - cell differentiation , while TCF - 1 / LEF - 1 play a crucial role in early thymocyte development 
Example solution: TCF - 1
Example explanation: The gene, TCF - 1 has been tagged as protein since it plays a crucial role in early thymocyte development.

Problem: D-myo-inositol 1-phosphate as a surrogate of D-myo-inositol 1,4,5-tris phosphate to monitor G protein-coupled receptor activation.

Solution: G protein-coupled receptor