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. 2018 Sep 7;9:989. doi: 10.3389/fphys.2018.00989

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Copyright © 2018 Bernabeu, Lu, Abu-Qamar, Aiello and Sun.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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BNR is defined as the largest caliber registered along the centerline of the MA body (blue arrows) divided by the narrowest caliber along the feeding/draining vessels (red arrows).