Who did have first dibs turned on the date when each of them not only isolated the DNA sequence but also "appreciated" what it had isolated. Sanofi-Aventis v. Pfizer Inc., No. 12-1345, slip op. 9 (Fed. Cir. Nov. 5, 2013) (affirming ruling that Pfizer's invention had priority over Sanofi's).
You have to get that you invented something. Eureka!