"velly interesting" to quote (rather dated I admit) Arte Johnson from Laugh-In. Sorry if I'm stating the obvious but the fact that rBChE is found in plasma--albeit in very small amounts--offers the possibility that recominant butyrl... will be less likely to produce extreme toxicity or other 'adverse events' compared to novel phamacuetical candidates.
The potential to make it in volume with a low capital outlay doesn't hurt either....