Section 101 of the Patent Act defines the subject matter that is eligible for patenting. Nearly 10 years ago, in Mayo and Alice, the Supreme Court established a two-step test for eligibility under §101. The Federal Circuit's subsequent application of that test has met criticism from legal commentators and from members of the court, with now-Chief Judge Moore recently calling the court "bitterly divided" on this issue. The Supreme Court nevertheless denied certiorari in several recent §101 cases, including one involving a "unanimous" "plea for guidance" from the Federal Circuit.