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. 2016 Mar 3;7:20. doi: 10.3389/fneur.2016.00020

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Copyright © 2016 Smith.

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) or licensor 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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Levels of agmatine, putrescine, spermidine, spermine, l-arginine, l-ornithine, and l-citrulline in the VNC in in aged (A) and young (Y) rats housed in either an enriched environment (Y) or not (N). Symbols represent means with the SE and SD for the mean. Modified from Liu et al. (69).