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:
Inclusion of the sequences between - 4 and + 52 enhanced promoter activity ; this was primarily because of an Sp1 recognition site at + 9 / + 15 .
answer:
Sp1 recognition site

question:
EBV utilizes CD21 / CR2 as its receptor on B cells to initiate the infection process .
answer:
CD21 / CR2

question:
Acyl - coenzyme A : cholesterol acyltransferase ( ACAT ) is an intracellular enzyme involved in cellular cholesterol homeostasis and in atherosclerotic foam cell formation .
answer:
intracellular enzyme