Table 7.

Genes flanking the trp operon

Gene	Number of times in the metagenome	Percent found near trp genes
TruA	30	93% are adjacent and before trpF
AccD	53	86.8% are adjacent and after trpA 9.4% are adjacent and after trpB; trpA is elsewhere 3.8% are adjacent and after trpF; trpB and A are absent
FolC	13	77% occur as trpA-accD-folC 23% occur in the order of trpB-accD-folC
PyrF	60	77% are before trpF in split operons 23% are before trpB
LexA	92	100% are adjacent and after trpC when trpF is elsewhere
MoaC	25	100% neighbor and are after trpC
PLPDE_IV	21	57% adjacent and after trpE 38% adjacent and after trpG