1. While their definition of industries does not match ours precisely, they do isolate "drugs" as an industry. They find that drug patents are somewhat more likely to be litigated than other sorts of patents. Lanjouw & Schankerman, supra note __, at __. Others have claimed that the biotechnology industry is particularly likely to engage in patent litigation;Biotechnology, Technology Policy, and Patentability: Natural Products and Invention in the American System