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have physiological differences, correlated with immunophenotypic profiles by Takahashi et al. During the early proliferative phase (0-12 months) the tumors express proliferating cell nuclear antigen (pericytesna), vascular endothelial growth factor (VEGF), and type IV collagenase, the former two localized to both endothelium and pericytes, and the last to endothelium. The vascular markers CD31, von Willebrand factor (vWF), and smooth muscle actin (pericyte marker) are present during the proliferating and involuting phases, but are lost after

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