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: To further identify the residues responsible for the activity , we isolated the mutant viruses that were not neutralized with the soluble form of MHV receptor proteins , since such mutants were expected to have mutations in amino acids responsible for receptor - binding activity .
Example Output: MHV receptor proteins

Example Input: Upstream tissue inhibitor of metalloproteinases - 1 ( TIMP - 1 ) element - 1 , a novel and essential regulatory DNA motif in the human TIMP - 1 gene promoter , directly interacts with a 30 - kDa nuclear protein .
Example Output: TIMP - 1

Example Input: This cell line expresses productively rearranged immunoglobulin genes as well as the Oct - 2 gene at high levels which are comparable to those observed in activated murine splenic B cells .
Example Output:
immunoglobulin genes