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. 2011 May 20;6(5):e20031. doi: 10.1371/journal.pone.0020031

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Köttgen et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Schematic model of the Drosophila female reproductive system. Ovary (ov), spermathecae (sp), seminal receptacle (sr), uterus (ut). B. Schematic of a mature sperm, showing the acrosome in pink and the sperm tail in green. C. Drosophila sperm tracking in the seminal receptacle (sperm tail labeled with dj-GFP: green, sperm head labeled with Prot-B-DsRed: red). D. The vast majority of sperm swim backward (n = 222 sperm, N = 11 flies).