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.

[Q]:  No evidence for the existence of a specific progesterone receptor in human mononuclear leukocytes was obtained as judged by the results of competition experiments where a progesterone receptor - specific ligand [ 3H ] Org 2058 was used .
[A]: progesterone receptor


[Q]:  Inhibition of STAT3 signaling leads to apoptosis of leukemic large granular lymphocytes and decreased Mcl - 1 expression .
[A]: Mcl - 1


[Q]:  Transient expression analyses in cells of neuroglial and lymphocytic origin demonstrated that some of these LTRs had activities which varied significantly from the LAI LTR in U - 373 MG cells ( an astrocytoma cell line ) as well as in Jurkat cells ( a CD4 - positive lymphocyte cell line ) .
[A]:
LAI LTR