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.

 Free protein S deficiency in acute ischemic stroke .
protein S

 In contrast , overexpression of the DREB2A cDNA induced weak expression of the target genes under unstressed conditions and caused growth retardation of the transgenic plants .
DREB2A cDNA

 To better understand the relationship between expression of an oncogene and genetic instability , we have studied a cell line expressing an activated human Ha - ras under the control of bacterial lactose operon regulatory elements for changes in methotrexate resistance and dihydrofolate reductase ( dhfr ) gene amplification following mutant Ha - ras induction .

dihydrofolate reductase