Further, the elimination of {TAIL ~ extraneous material} and the fractionation of mixtures of molecular species into the constituent species has resulted in achieving {HEAD ~ significantly greater potency} and repeatability in the resulting products than was possessed by the prior materials 
Further , the elimination of { TAIL ~ extraneous material } and the fractionation of mixtures of molecular species into the constituent species has resulted in achieving { HEAD ~ significantly greater potency } and repeatability in the resulting products than was possessed by the prior materials
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