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. 2016 Apr 12;3(2):15. doi: 10.3390/jcdd3020015

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Brightfield microscopy image of a semi-intact wild-type third instar larval heart. The Drosophila heart harbors two specialized valve cells that regulate blood flow directionality.