Lots of work has been done in order to overcome the size problem of the cDNA for packaging into viral vectors and it is known for over a decade that a deleted B-domain FVIII variant is the way to go because it reduces the size and increases mRNA levels compared to the wild type. From here, designing and testing different partially deleted B-domain FVIII variants was clearly the path and I would think it takes both luck and skills but mainly hard work to come up with the best variant (improved properties to result in better dosing, efficacy, safety, and durability).
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