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:
 A selective transcriptional induction system for mammalian cells based on Gal4 - estrogen receptor fusion proteins .
answer:
estrogen receptor


question:
 Interestingly , unlike PAK65 , HPK1 does not contain the small GTPase Rac1 / Cdc42 - binding domain and does not bind to either Rac1 or Cdc42 , suggesting that HPK1 . activation is Rac1 / Cdc42 - independent .
answer:
small GTPase


question:
 In agreement with this , archaea appear to lack eIF5 , eIF2B and the lysine - rich binding domain for these factors in their eIF2beta homolog .
answer:

eIF2beta homolog