Silencing Sox21b-1 in Spiders (image) eLife Share Print E-Mail 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 et al., 2018 Usage Restrictions This image is free to be reused, as long as it is credited as appropriate. 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.