Assertion: tryptophan's level | /r/HasProperty | rowan et al.
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text: For example, a decrease in Bacteroidetes (Frank et al., 2007) and Bacteroides (Nemoto et al., 2012) levels are reported in IBD patients, as were increases in Desulfovibrio and Bilophila levels (Rowan et al., 2010; Jia et al., 2012).