Bone Formation upon Partial Amputation of Zebrafish Tail Fins (image) Universität Bayreuth Share Print E-Mail Caption On the left is normal regeneration of fin rays. On the right is irrregular bone formation in fins with widely expanded production of the signaling protein Sonic Hedgehog. Credit Developmental Biology, University of Bayreuth. Usage Restrictions None Share Print E-Mail 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.