https://www.lipophilic-platinum.com/2016/09/07/to-look-at-the-precise-functionality-of-the-na-stalk-area-in-viral-assembly-entry-and-launch-we-deleted-the-twenty-aa-stalk-section-from-09n1-to-create-09n1-s60-and-we-inserted-this-s60-section-in/