KLK3 and cancer: Third, a dual amplifying FA assay for label-free detection of respiratory syncytial virus DNA fragments with size-control synthesized MIL-101 has been reported.89 Moreover, metal–organic gel (MOG), composed by the self-assembly of metal ions and suitable ligands through noncovalent interactions with the same feature as MOFs that are able to adsorb ssDNA, was also exploited as a novel amplification platform for FA assay by Li's group.90 This strategy achieved a sensitive detection of a common cancer biomarker, prostate specific antigen (PSA).