Where could a virologist find hemagglutinin?

A virologist could find hemagglutinin, "Hemagglutinin (HA) is a protein located at the virus most external layer, the envelope. It recognizes one sugar of our cell membrane, sialic acid, which it is responsible for the virus recognition and binding to our respiratory system cells."

I hope this helps!

          - DaMomsMom

really dont know just need some points

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs