title: Materials science. Tiny particles flag scarce proteins.
mesh_terms: D000906:Antibodies; D000911:Antibodies, Monoclonal; D018076:DNA, Complementary; D004277:DNA, Single-Stranded; D006046:Gold; D006801:Humans; D007501:Iron; D008280:Magnetics; D008863:Microspheres; D015336:Molecular Probe Techniques; D036103:Nanotechnology; D017430:Prostate-Specific Antigen / Q000032:analysis*; D011506:Proteins / Q000032:analysis*; D012680:Sensitivity and Specificity
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D018076:DNA, Complementary; D004277:DNA, Single-Stranded; D011506:Proteins; D006046:Gold; D007501:Iron; D017430:Prostate-Specific Antigen