NEW DELHI : Scientists have identified and further developed novel antibody fragments from llamas and alpacas that can be used against the SARS CoV-2 virus which causes Covid-19.These "nanobodies" identified by an international team led by the University of Bonn in Germany are smaller than classic antibodies.They can penetrate the tissue better and can be produced in larger quantities.The team also combined the nanobodies into potentially effective molecules attacking different parts of the virus simultaneously.The approach, described in the journal Science, could prevent the pathogen from evading the active agent through mutations.Antibodies are an important weapon in the immune system's defence against infections.They bind to the surface.