Both healthy plant and pathogen-free plant had not these symptoms, yet there were some different in tissue differentiation of both.
健株和脱病植株地上部营养器官均不存在上述症状，但两者在组织结构分化程度上有所区别。
2
LCT's pig herd is derived from the Sub-Antarctic Auckland Islands and bred in bird-proof pathogenfree facilities.
LCT的猪群来自于近南极的奥克兰岛且在防鸟的，不带致病病原体的设施中繁殖。
3
This review focuses on the methods of isolation and cultivation of pathogenic free-living amoebae, including sample treatment, culture conditions, passage culture, pathogen detection, and maintenance.