This invention is directed to a ligand-receptor assay for determining the presence of at least one target ligand, capable of competing with a ligand analogue conjugate for binding sites available on a ligand receptor, said ligand analogue conjugate comprising at least one ligand analogue coupled to...http://www.google.ca/patents/US5679526?utm_source=gb-gplus-sharePatent US5679526 - Threshold ligand-receptor assay
