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:
 The present study also emphasizes the need of establishing dose - response curves to correctly assess the relative contribution of the different regions of steroid hormone receptors in activation of transcription .
answer:
steroid hormone receptors


question:
 This difference between SP - 1 and SP - 2 peptides was not due to their differential uptake by cell , since approximately 100 times more SP - 2 peptide could be found in cytoplasmic extracts than SP - 1 peptide in experiments using radiolabeled peptides .
answer:
SP - 1


question:
 In the HIV LTR , this region has been demonstrated to have both positive and negative regulatory effects on HIV gene expression .
answer:

HIV LTR