Carbon and nitrogen isotope values from bone collagen of Mediterranean late Upper Palaeolithic (17–11 ka cal BP) and Mesolithic (10-8 ka cal BP) humans.

<p>(*)the C/N ratios of the human bone collagen from Grotta dell’Uzzo are at the limit for well-preserved collagen ( = 3.6). In the absence of other published data on the quality of the collagen (%C, %N, %yield) analysed by Francalacci <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049802#pone.0049802-Francalacci1" target="_blank">[5]</a>, the isotope ratios of these individuals should be considered with caution. The low δ¹³C values might, in fact, be due to contamination.</p><p>(**)the standard deviation could not be calculated because the raw data was not published by Paine et al. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049802#pone.0049802-Paine1" target="_blank">[6]</a>.