jsc2019e039826 (7/27/2017) --- This preflight image shows a monoclonal antibody binding to a ligand in the inter-cellular space. Monocronal antibodies can fight a wide range of diseases by very selectively binding to their targets, thus leaving healthy tissues and cells intact. Monoclonal Antibody Production and Stability in Microgravity-Formulation Study (CASIS PCG 19) compares the impact of microgravity on antibody formulation stability to stability trends observed on Earth. The study may broaden an understanding of the routes of antibody degradation and, as space travel becomes more common, it may improve knowledge of monoclonal antibody therapeutic stability for treating patients in space environments.