The envelope (E) protein from coronaviruses is a small polypeptide that contains at least one alpha-helical transmembrane domain. Absence. or inactivation. of E protein results in attenuated viruses. https://www.roneverhart.com/HP-Notebook-15-da0008ca-HD-LED-15-6-Touchscreen-Intel-Core-i5-8250U-1-6-GHz-8-GB-RAM-1-TB-SSD-HDMI-USB-Multi-format-S/