唯一可接受的分类码是空白码，其中空格会被抑制。
The only category codes where this is acceptable is blank where blanks are suppressed.
空白纳米粒对细胞抑制轻微，且不具有时间和浓度依赖性。
Blank albumin nanoparticles had a little inhibition on SW1990 cells without correlation with time or concentration.
结果显示，VEGF ASODN对U937细胞的VEGF的表达有明显的抑制作用，与错义序列组和空白对照组相比有显著差异（P<0 .0 5 ） ；
The result showed that VEGF ASODN had obviously inhibitive effect on expression of VEGF in U937 cell, as compared with scrambled sequence and negative control (P<0.05).
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