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Patterns of lesion frequency around intercostal ostia (a) from six mice aged 16–20 weeks (after McGillicuddy et al. 2001), (b) from six young rabbits, six weeks old, and (c) from five mature rabbits of average age 27 months (after Barnes & Weinberg 1999). Frequency increases with shading. Mean aortic flow is from top to bottom and X marks the centre of the ostium.
