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→Multi-output FFLs
===Multi-output FFLs===
===Multi-output FFLs===
In some cases the same regulators X and Y regulate several Z genes of the same system. By adjusting the strength of the interactions this motif was shown to determine the temporal order of gene activation. This was demonstrated experimentally in the flagella system of ''[[Escherichia coli|E. coli]]''.<ref name="kal2">{{cite journal |vauthors=Kalir S, McClure J, Pabbaraju K, etal |title=Ordering genes in a flagella pathway by analysis of expression kinetics from living bacteria |journal=Science |volume=292 |issue=5524 |pages=2080–3 |date=June 2001 |pmid=11408658 |doi=10.1126/science.1058758 }}</ref>
In some cases the same regulators X and Y regulate several Z genes of the same system. By adjusting the strength of the interactions this motif was shown to determine the temporal order of gene activation. This was demonstrated experimentally in the flagella system of ''[[Escherichia coli|E. coli]]''.<ref name="kal2">{{cite journal |vauthors=Kalir S, McClure J, Pabbaraju K, etal |title=Ordering genes in a flagella pathway by analysis of expression kinetics from living bacteria |journal=Science |volume=292 |issue=5524 |pages=2080–3 |date=June 2001 |pmid=11408658 |doi=10.1126/science.1058758 }}</ref>
===多输出前馈回路===
在某些情况，相同的调控子X和Y可以调控同一系统中的多个Z基因。通过调节相互作用的强度，这些网络可以决定基因激活的时间顺序。这一点在[[大肠杆菌]]的鞭毛系统中有实验证据。<ref name="kal2">{{cite journal |vauthors=Kalir S, McClure J, Pabbaraju K, etal |title=Ordering genes in a flagella pathway by analysis of expression kinetics from living bacteria |journal=Science |volume=292 |issue=5524 |pages=2080–3 |date=June 2001 |pmid=11408658 |doi=10.1126/science.1058758 }}</ref>
===Single-input modules (SIM)===
===Single-input modules (SIM)===