Larger Image ralgds gene expression in Xenopus laevis embryo via in situ hybridization, NF stage 20, lateral view, anterior left. Image copyrighted by: XDB3 Copyright © XDB3 Gene Synonyms Species Stage(s) Tissue ralgds.S X. laevis Throughout NF stage 20 ectoderm epidermis mesoderm somite paraxial mesoderm Image source: Community submitted Permanent Image Page Printer Friendly View XB-IMG-23666