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Table 2 Clustering scores (CC) for metabolic clustering of genes recently transferred horizontally into E. coli K12. Two horizontally transferred (HGT) genes were considered metabolic neighbours if they encode reactions that catalyse tightly correlated fluxes in the E. coli K12 metabolic network

From: Horizontally transferred genes cluster spatially and metabolically

Method # HGT candidates Expected pairs Observed pairs CC p
terminal.pen1 205 4.68 24 5.128 <0.001
terminal.pen2 85 0.80 0 0.000 0.76