Today we look back at some too-slightly-celebrated work by Ratto and by Bravo. Ratto on centrifuged artificial llama vagina: “Biochemical isolation and purification of ovulation-inducing factor (OIF) in seminal plasma of llamas,” Marcelo H Ratto [pictured here], Louis TJ Delbaere, Yvonne A Leduc, Roger A Pierson and Gregg P Adams, Reproductive Biology and Endocrinology, 2011; 9: […]