title: Cell lineage in early development.
mesh_terms: D000818:Animals; D004330:Drosophila / Q000196:embryology; D004626:Embryology / Q000379:methods*; D006735:Horseradish Peroxidase; D007865:Leeches / Q000196:embryology; D014981:Xenopus / Q000196:embryology
chemical_list: D006735:Horseradish Peroxidase