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Example sentences for: rkn

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The best match to a eukaryotic glutamine synthetase (GSII) is substantially lower (Table 3), strongly implicating the RKN gene as a robust candidate for an HGT event.
Another RKN gene also postulated to have been acquired by HGT, and which encodes polyglutamate synthetase, was previously identified in M. artiellia [ 23 ] . Significantly, hybridization data showed that this particular gene is absent from both the M. javanica and G. rostochiensis genomes [ 23 ] . We speculate that acquisition of this gene by M. artiellia is a recent HGT event (event 'c', Figure 1), and thus it is truly absent from the Meloidogyne genomes from which our datasets were derived.
A possible ancient bacterial origin of these genes has been theorized [ 17 18 19 ] . A bacterial origin for a number of root-knot nematode (RKN) genes also has been proposed, although their possible role in parasitism is less clear.
On the basis of both amino-acid sequence similarity (Table 3) and a Pfam [ 36 ] HMM search (e-value 4.3e -24), it is clear that the RKN glutamine synthetase is a GSI homolog, implying a prokaryotic origin.
Significantly, the solitary significant match of the Meloidogyne NodL sequences to a eukaryote is to a yeast serine-acetyltransferase, an enzyme clearly separated from the RKN by function as well as in our phylogeny (Figure 2).