Drop tests on YP- and MMB-tributyrin media after 5 days of culture.

<p>Four spots are shown, with approximately 5 to 625 cells, from right to left. A halo is present around strains <i>YALI</i>, <i>YADE</i>, <i>YAOS</i>, <i>YAPH</i> and <i>YAHO</i>. Strains are represented by an abbreviation of their species name, as shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0063356#pone-0063356-t001" target="_blank">Table 1</a>.</p>