<sup>15</sup>N-enrichment of leucine in the deproteinized plasma, crude mucin and excreta sampled from precision-fed cecectomized roosters after a single-injection of <sup>15</sup>N-leucine<sup>1</sup>.

<p><sup>15</sup>N-enrichment of leucine in the deproteinized plasma, crude mucin and excreta sampled from precision-fed cecectomized roosters after a single-injection of <sup>15</sup>N-leucine<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0188525#t002fn002" target="_blank"><sup>1</sup></a>.</p>