ViroPharma Inc., of Exton, Pa., decided to give Cinryze (C1 esterase inhibitor [human]) for routine prophylaxis against attacks of hereditary angioedema (HAE) its best shot, and has licensed recombinant human hyaluronidase enzyme (rHuPH20) technology from Halozyme Therapeutics Inc., of San Diego, to develop a subcutaneous formulation of the drug.