blocking antibody
an antibody which blocks the interaction of its antigen (target protein) with its interaction partners
en-US/ˈblɑkɪŋ ˈæntiˌbɑdi/
en-GB/ˈblɒkɪŋ ˈæntɪbɒdɪ/
an antibody which blocks the interaction of its antigen (target protein) with its interaction partners