The Biology of the TGF-β Family (IMAGE) Cold Spring Harbor Laboratory Press Caption Three-dimensional structures of pro-TGF-β1 (upper left), bone morphogenetic protein (BMP)-7 bound to two molecules of noggin (upper right), and TGF-β1 bound to the extracellular domains of type I (TβRI) and type II (TβRII) receptors (lower panel). Credit Cover art created by Masato Morikawa, The University of Tokyo. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.