Larger Image arf4 gene expression in Xenopus laevis, NF stage 29&30 embryo, in situ hybridization, lateral view, anterior left. Image Copyrighted by Pollet, Nicolas Copyright © CNRS UMR 8080, Nicolas Pollet Image published in: AXELDB Database, AxelDB (Image Pages) Gene Synonyms Species Stage(s) Tissue arf4.L arf2 X. laevis Throughout NF stage 29 and 30 cement gland eye fin neural crest pharyngeal arch pronephric kidney somite lens placode pronephric duct paraxial mesoderm presomitic mesoderm spinal cord brain heart primordium Image source: Large scale screen Permanent Image Page Printer Friendly View XB-IMG-29115