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A: BuMECs from passage 6 forming papillate (arrow) structure after 15 days of growth on plastic substratum (×100); B: BuMECs from passage 8 forming papillate (arrow) structures after 15 days of growth on plastic substratum (×100). Papillate structures represent a small nipple-like projection above the plastic substratum indicating differentiation characteristics of BuMECs.
