title: The asexual pre-cyst development of Sarcocystis tenella in experimentally infected specific pathogen-free lambs.
mesh_terms: D000818:Animals; D009928:Organ Specificity; D012522:Sarcocystis / Q000254:growth & development* / Q000302:isolation & purification; D012523:Sarcocystosis / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology*; D013047:Specific Pathogen-Free Organisms