Silencing Sox21b-1 in Spiders (IMAGE) eLife Caption Silencing the Sox21b-1 gene in the spider Parasteatoda tepidariorum results in the loss of three leg-bearing segments and the posterior segment addition zone. Credit Paese <em>et al</em>., 2018 Usage Restrictions This image is free to be reused, as long as it is credited as appropriate. 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.