SAN DIEGO--(BUSINESS WIRE)--Ligand Pharmaceuticals Incorporated (NASDAQ: LGND - News) announced today that it has transferred exclusive license rights to Proximagen Limited (AIM: PRX) for a series of compound hits related to the CXCR4 target with application for a number of indications including those related to the central nervous system. Ligand will receive an upfront payment and continue to be entitled to receive potential future milestone and royalty payments.