NeuExcell Therapeutics and Spark Therapeutics announced a gene therapy collaboration aimed at developing a safe and effective treatment for patients suffering from Huntington's Disease (HD). Under the terms of the agreement, Spark Therapeutics will receive access to NeuExcell's proprietary neuro-regenerative gene therapy platform and capabilities. NeuExcell's research team will collaborate closely with Spark Therapeutics to advance the program. Under the Option License NeuExcell is eligible to receive upfront, license fees, R&D and Sales milestone payments up to approximately $190 million plus product royalties. Under this Agreement, Spark Therapeutics has the option to license the exclusive worldwide rights of the NeuExcell's HD program.