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: This compound consists of A and B chains linked together by three disulfide bonds, which are conserved through most species, particularly the C-terminal residues of the B chain. Existing naturally as a monomer or dimer, lispro is a commercial hexamer of this enzyme that facilitates slow diffusion in the blood. It works by binding to specific tyrosine kinase receptors in target cells, causing glucose transporters to fuse with plasma membranes. Secreted by the islets of Langerhans, FTP, identify this enzyme important in regulating the body's sugar levels.
Output:
Science