Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: Adding polyethylene glycol to one type of these molecules is believed to be able to increase their half-life in vivo, an approach that lead to the drug PEGASYS. A common member of this family can be synthesized by activation of the TLR7 receptor, and most molecules in this family act through the expression of protein kinase R and inhibition of eIF2. Trypanosomes are able to induce waves of expression of the gamma form of these molecules, and the alpha type is commonly used to treat hepatitis, gential warts, and Kaposis sarcoma. They are usually synthesized by lymphocytes in response to double stranded RNA. FTP, name these proteins that stimulate immune defenses in virus-infected cells.
A:
Science