instruction:
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.
question:
 Previously described enhancement of in vitro transcription that was only seen with nuclear extracts derived from B - cell neoplasms corresponding to the late stages of B - cell differentiation was shown to be dependent on the actions of these factor ( s ) on the DNA region within the V kappa gene promoter .
answer:
V kappa


question:
 HIV replication was increased by PC - PLC in chronically infected monocytes and T lymphocytes .
answer:
PC - PLC


question:
 Receptor cleavage by these and other endogenous enzymes may account for previous observations of ` ` abnormal ' ' receptors in cytosols from some leukemic specimens .
answer:

endogenous enzymes