Fig. (1) Posterior-Anterior X-ray subtraction angiogram obtained during tracer injection via a guide catheter placed in the right CCA in a macaque. Major cerebral vessels are annotated: CCA-common carotid artery, ECA-external carotid artery, ICA-internal carotid artery (supplying the brain), MCA-middle cerebral artery, M1-branch of the MCA. White arrow at the top indicates the midline of the brain.