Additional file 1 of The high methylation level of a novel 151-bp CpG island in the ESR1 gene promoter is associated with a poor breast cancer prognosis

Additional file 1: Fig. S1. Expression of ERα in the mammary gland determined by immunodetection. Representative images correspond to control patients (a), case ERα− patients (b–d), and case ERα+ patients (e–g). Histological analysis was performed on paraffin-embedded mammary gland and imaged at 40×. Scale bar = 50 µm.