Fig. 1From: Comparison of the types of candidate reference samples for quality control of human epidermal growth factor receptor 2 status detectionThe HE staining results of three kinds of samples compared with clinical specimen. a is section of cell lines sample; b is section of agarose gel within cell lines sample; c is section of xenograft tumor sample. All these sections were derived from cell lines of MCF-7. d is section of clinical specimen (A2)Back to article page