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. 2014 Oct 31;5:427. doi: 10.3389/fphys.2014.00427

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Copyright © 2014 Mazzatenta, Marconi, Zara, Cataldi, Porzionato and Di Giulio.

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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Morphometric analysis of the connective tissue fibers in human carotid body sections in healthy (young and old) and drug-addicted subjects, performed on Mallory trichrome staining. The One-Way ANOVA demonstrates a significant increase in the connective tissue fibers through the aging process and with drug addiction (p < 0.001).