The surface of the coronavirus membrane is shown in gray or yellow. The spike protein is shown in red or magenta. Magnets embedded in 2 spike proteins at the bottom of the virus allow it to dock with the “host cell” base, binding to an ACE2 receptor that is colored green on both models. The antibody (yellow) included with each model also has a magnet, allowing you to model how an antibody finds and attaches to the receptor-binding domain of the spike protein, preventing it from binding to the ACE2 receptor. Pipe cleaner RNA viral genome is provided in the small model and mini toober RNA viral genome is provided in the medium and large models.