An asymmetric tetrabody is a potent and efficacious agonist of the erythropoietin receptor in vitro and in vivo. - Adams JJ; Blazer LL; Chung J; Karimi M; Davidson T; Bruce HA; Singer AU; Yang N; Cardarelli L; Pot I; Colombo L; Huang LJ; et al. (Protein science : a publication of the Protein Society, 2025)