Early changes in bursa of fabricius from Marek's disease.
D000818:Animals; D001353:Avian Leukosis / Q000473:pathology*; D001354:Avian Leukosis Virus / Q000302:isolation & purification; D002060:Bursa of Fabricius / Q000473:pathology*; D002645:Chickens; D005260:Female; D008297:Male; D011201:Poultry Diseases / Q000473:pathology*