title: Ultrastructural appearance of freeze-substituted schistosomula of Schistosoma mansoni frozen by a two-step cooling schedule.
mesh_terms: D000818:Animals; D005612:Freeze Drying; D005615:Freezing; D008854:Microscopy, Electron; D009584:Nitrogen; D012550:Schistosoma mansoni / Q000648:ultrastructure*
chemical_list: D009584:Nitrogen