A need for exogenous nucleotides may be expected when the body is growing rapidly or encounters immune challenge.
但机体在快速生长或受到免疫挑战时，需要外源添加核苷酸。
Two trials were conducted to study Glucagon-like peptide 2 secretion in postweaning piglets and the effect of immune challenge on gut development and GLP-2 level.
通过2个试验研究了断奶仔猪胰高血糖素-2（GLP-2）的分泌规律和免疫应激对断奶仔猪肠道发育及GLP-2分泌的影响。
A major challenge in treating pancreatic tumors is overcoming their ability to force immune cells to tolerate and even support their growth.
治疗胰腺肿瘤一项重要的挑战是如何来克服这些肿瘤使免疫细胞耐受甚至支持肿瘤生长的能力。
Cyber security is a global challenge. No country can stay aloof or immune from it. Maintaining cyber security is the Shared responsibility of the international community.
网络安全是全球性挑战，没有哪个国家能够置身事外、独善其身，维护网络安全是国际社会的共同责任。
CONCLUSION: Cellular immune response in the skin of the mice immunized with UV-attenuated cercariae might play an important role in the protective immunity against challenge infection.
结论：提示皮肤组织的细胞免疫反应在血吸虫减毒尾蚴免疫的宿主抗攻击感染保护性免疫中起重要作用。
Cyber security is a global challenge, no country can stay aloof or immune from it. Maintaining cyber security is the Shared responsibility of the international community.
网络安全是全球性挑战，没有哪个国家能够置身事外、独善其身，维护网络安全是国际社会的共同责任。
Following vaccination, the efficacy of vaccine preparations on fish was studied by using nonspecific immune assays and monitoring specific antibody production (ELISA) and artificial challenge tests.
为评价疫苗的免疫效果，从而为鳗弧菌疫苗的推广和应用提供理论根据，还研究了牙鲆和鲈鱼对鳗弧菌疫苗的免疫应答。
Following vaccination, the efficacy of vaccine preparations on fish was studied by using nonspecific immune assays and monitoring specific antibody production (ELISA) and artificial challenge tests.
为评价疫苗的免疫效果，从而为鳗弧菌疫苗的推广和应用提供理论根据，还研究了牙鲆和鲈鱼对鳗弧菌疫苗的免疫应答。
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