Developing Vertebrate Bones (IMAGE) University of Southern California Caption A rendition of developing vertebrate bones. Hironori Hojo and his colleagues examined the transcriptional action and evolution of Sp7, a key determinant of vertebrate-restricted, bone-forming osteoblasts. Credit (Kristen Chen/<i>Developmental Cell </i>2016) Usage Restrictions Use credit and caption information. 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.