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Table 3 Backbone sequences for C4

From: Specialized or flexible feed-forward loop motifs: a question of topology

βXY, 1

β XY, β Y

Z0|X = 0, Z HA |X > 0

Z0|X > 0, Z HA |X = 0

Slope

ϕX = 0, ϕX > 0

ϕX = 0, ξ

Relation

Function

>

*

*

*

+

*

*

ξ > S > ϕX > 0

G +

>

*

<

*

-

*

*

ξ > S > ϕX > 0

G +

>

*

<

*

-

*

*

ξ > ϕX > 0> S

G +

>

*

<

*

-

*

*

S > ξ > ϕX > 0

G +

>

>

*

*

*

*

ξ > S > ϕX > 0

G +

>

>

*

*

*

*

ξ > ϕX > 0> S

G +

>

>

*

*

*

*

S > ξ > ϕX > 0

G +

*

<

*

*

*

*

<

ξ > S > ϕX > 0

G +

*

<

*

*

*

*

<

ξ > ϕX > 0> S

G +

*

<

*

*

*

*

<

S > ξ > ϕX > 0

G +

*

<

*

*

*

>

*

ϕX > 0> S > ξ

G -

>

*

*

*

+

*

*

ξ > ϕX > 0> S

P + T +

>

*

*

*

+

*

*

S > ξ > ϕX > 0

P + T +

*

<

*

*

*

>

*

S > ϕX > 0> ξ

P - T -

*

<

*

*

*

>

*

ϕX > 0> ξ > S

P - T -

*

<

*

*

*

<

>

ϕX > 0> S > ξ

Impossible

*

<

*

*

<

>

ϕX > 0> ξ > S

P - T +

*

<

*

*

<

>

S > ϕX > 0> ξ

P - T +

  1. All possible backbone sequences for C4 and its relation to the circuit's function.