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. 2013 Nov 8;5:69. doi: 10.3389/fnagi.2013.00069

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Copyright © 2013 Gray, Rudolph, Engle and Recanzone.

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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Comparison of parvalbumin positive cell density of the MGN between the 15- and 35-year-old animals. Comparison of micrographs from a (A) 15 year old vMGN and (B) 35 year old vMGN reveals apparent age-related increases in the number of stained cells. However, when comparing a (C) 15 year old dMGN with a (D) 35 year old dMGN, no apparent age-related changes in the number of stained neurons are seen. Similar to the vMGN, the mMGN showed age-related increases between the (E) 15 year old or and (F) 35 years old animals. The left side of this image corresponds to the medial aspect and the top to the dorsal aspect of the sections. Scale bar = 150 μm.