1.
A549和A549/DDP细胞的非极性（A）和极性（B）层提取物的原始谱图（横轴表示时间，纵轴表示强度）
The original spectrum of (A) non-polar metabolite profile and (B) polar metabolite profile of A549 and A549/DDP cells (X-axis stands for time, Y-axis stands for intensity)
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