xenoantigen

例句：

1. 1. The studyof xenoantigens has ledto the development of vaccines against diseasescaused by pathogens from other countries.
   研究外来抗原导致了疫苗的开发，用于预防来自其他国家的病原体引起的疾病。
2. 2. The immune system recognizes xenoantigens asforeign and mounts an immune response toneutralize them.
   免疫系统将外来抗原视为外来并发起免疫反应以中和它们。
3. 3.Xenoantigens are a majorchallenge in the field of infectious disease research, as they can cause severe allergic reactions in individuals with pre-existing allergies.
   在传染病研究领域，外来抗原是一个主要的挑战，因为它们可以在有过敏史的人中引起严重的过敏反应。