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Representative photomicrographs showing the levels of aldehyde dehydrogenase 1 (ALDH1) immunostaining in axillary lymph node metastases from patients with breast cancer: (a) negative, score 0; (b) weakly positive, score 1; (c) moderately positive, score 2; (d) strongly positive, score 3. Scale bar 100 μm. The colour version of this figure is available at: http://imr.sagepub.com.
