Fig. 2
From: Vaccines platforms and COVID-19: what you need to know
Structure of a spherical oily coated Beta-Coronavirus. A single-stranded positive-sense RNA (30Â kb) surrounded by the (S), Envelope (E), and Membrane (M), and the enlargement of a Spike Protein (S), responsible for the entrance into the host cells via Angiotensin Converting Enzyme 2 (ACE2) human receptor