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. 2009 Oct 23;4(10):e7537. doi: 10.1371/journal.pone.0007537

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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The decrease in abundance of protein “X” in a male's ejaculate is associated with increased male age (A; each lane represents the protein from a single spermatophore), while (B) demonstrates the statistical significance of this relationship (each point represents the data from a single spermatophore). (C) The association between male age and a male's ability to induce a female to lay eggs – suggesting that the relative abundance of protein “X” may be linked to a male's ability to induce a female to lay eggs.