Q: 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.
We have also detected a DNA - protein interaction that may be involved in the cell - type specificity of immunoglobulin expression , and we have determined that a sequence upstream of the octamer participates in an interaction with a nuclear protein ( s ) .
A:
nuclear protein