Table 1.

Total number of specific TFBS pairs for the simulation data set using different α-values.

α-value	Rank of artificially inserted pair	Total number of pairs found
α = −1	18	58
α = 0	16	55
α = 0.1	15	47
α = 0.15	14	43
α = 0.2	12	40
α = 0.25	11	37
α = 0.5	6	28
α = 0.75	6	25
α = 1	5	21

The rank according to z-score indicates the position of the inserted pair. The scaling factor α = −1 indicates the significant TFBS pairs identified by the original PC-TraFF algorithm.