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.

This pathway can be used to reduce the amount of the toxic terpenoid gossypol in cotton seeds without doing so in the rest of the plant. The original research on this concept was performed using the unc-22 and unc-54 genes, important to muscle contraction. One result of this pathway sees cleavage by Argonaute. This process begins when a certain type of double-stranded nucleic acid is cleaved by the Dicer enzyme and incorporated into the RISC. A diet of transformed bacteria induces this process in C. elegans, where it was discovered by Andrew Fire and Craig Mello. For 10 points, name this cellular mechanism which stops the transcription of a gene.
Science