The present invention relates to single domain ligands derived from molecules in the immunoglobulin (Ig) superfamily, receptors comprising at least one such ligand, methods for cloning, amplifying and expressing DNA sequences encoding such ligands, preferably using the polymerase chain reaction, methods...http://www.google.de/patents/US6545142?utm_source=gb-gplus-sharePatent US6545142 - Single domain ligands, receptors comprising said ligands, methods for their production, and use of said ligands and receptors
