Given the task definition and input, reply with output. 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.

 A comparison of the CPG assay to dextran coated charcoal and a whole cell assay demonstrates that CPG and dextran coated charcoal give equivalent measurements of cytosolic receptor concentration , while the CPG and whole cell assays provide equivalent values for total receptor content .

cytosolic receptor