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a, b Invasive carcinomas of the breast, triple-negative (TNBCs), representative of the majority of cases in Fig. 2c (orange box). Invasive ductal (a) and invasive lobular (b) carcinomas of the breast, featuring fairly high CD34+ tumor vessel counts (right panels). In both cases only a rare tumor stromal vessel shows immunoreactivity for VEGFR2 (black arrows, left panels). Original magnification ×200
