these assays were improved by ( a ) irradiating microtiter plates or polystyrene tubes before coating with antibody or protein a , ( b ) coating the plastic trays with nonspecific anti-gamma-globulin or protein a instead of the steroid-specific first antibody , and ( c ) partial denaturation of the second antibody before coating the plates or tubes with it .
C0032604
polystyrene
C0032167
plastic