title: Direct observation of cell migration into Xenopus thymus rudiments through mesenchyme.
mesh_terms: D000818:Animals; D002465:Cell Movement; D005260:Female; D007814:Larva / Q000166:cytology; D008297:Male; D013950:Thymus Gland / Q000166:cytology* / Q000648:ultrastructure; D013997:Time Factors; D014981:Xenopus / Q000276:immunology*