At the recent European Respiratory Society meeting, researchers from 35Pharma Inc. presented data on HS-235, an activin receptor inhibitor designed to neutralize activins and growth differentiation factors (GDFs). Disorders such as heart failure (HF) and pulmonary hypertension (PH) are associated with dysregulated activin and GDFs without neutralizing bone morphogenetic proteins such as BMP-9 and BMP-10, which play key roles in lymphatic and vascular homeostasis.