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.
Input: Cleaving its hinge with papain separates its Fc [eff-cee] and Fab [eff-ay-bee] portions. Its structure was established by Gerald Edelman and Rodney Porter, who found a characteristic beta fold in each of its 8 constant domains. The A type is found in saliva and milk, the G type activates macrophages, and the M type is made by B cells early in immune response. Consisting of two heavy chains and two kappa or lambda light chains and variable regions, FTP, name this immune protein produced in response to the presence of a specific antigen.
Output:
Science