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Ventral views of cast murine aortic arches showing the right internal thoracic artery (rit) either branching off from a long brachiocephalic trunk (bct) (left side of the figure) or from the right subclavian artery (rs) (right side of the figure) when the brachiocephalic trunk is very short (R and L = right and left side of the thorax, respectively). rcc, right common carotid artery; lcc, left common carotid artery; ls, left subclavian artery.
