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Ultrasonic Doppler analysis of blood flow in syngeneic grafts 50 days after transplantation. Bidirectional blood flow velocity with the two-stitch sleeve technique (A) and its control left common carotid artery (B). Bidirectional blood flow velocity with the traditional microsuture technique (C) and its left control common carotid artery (D). Green lines represent the location of blood flow measured, while white arrows are pointed to the cardiac grafts.
