It seems that everyone has it to varying degrees, however it probably doesn’t seem to explain asymptomatic infections unless the virus has the capacity to shed

It seems that everyone has it to varying degrees, however it probably doesn’t seem to explain asymptomatic infections unless the virus has the capacity to shed the protein which doesn’t seem to be the case, or that people with asymptomatic infection produce enough of this protein that sars-covid-19 has hard time accumulating and causing the disease, and an asymptomatic patient spreads the virus to people who produce far less of this protein. According to the authors the protein binds “like velcro” effectively immobilising and preventing infection. Symptoms would occur if sufficient cells were infected thus the second case sounds plausible to a degree. I am not a virologist so take everything with a huge grain kf salt.