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Table 4 Backbone sequences for I1

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

βXY, 1

βXY, βY

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 > ϕX > 0> S

G +

>

*

*

*

+

*

*

S > ξ > ϕX > 0

G +

>

*

<

*

-

*

*

ξ > S > ϕX > 0

G +

>

>

*

*

<

*

ξ > S > ϕX > 0

G +

*

<

*

*

*

<

*

ξ > S > ϕX > 0

G +

*

<

*

*

*

*

>

S > ϕX > 0> ξ

G -

*

<

*

*

*

*

>

ϕX > 0> ξ > S

G -

*

<

*

*

*

*

>

ϕX > 0> S > ξ

G -

>

*

<

*

-

*

*

ξ > ϕX > 0> S

P + T +

>

*

<

*

-

*

*

S > ξ > ϕX > 0

P + T +

>

>

*

*

<

*

ξ > ϕX > 0> S

P + T +

>

>

*

*

<

*

S > ξ > ϕX > 0

P + T +

*

<

*

*

*

<

*

ξ > ϕX > 0> S

P + T +

*

<

*

*

*

<

*

S > ξ > ϕX > 0

P + T +

>

>

*

*

>

*

ξ > S > ϕX > 0

Impossible

>

>

*

*

>

*

ξ > ϕX > 0> S

P + T -

>

>

*

*

>

*

S > ξ > ϕX > 0

P + T -

*

<

*

*

*

>

<

ξ > S > ϕX > 0

Impossible

*

<

*

*

*

>

<

ξ > ϕX > 0> S

P + T -

*

<

*

*

*

>

<

S > ξ > ϕX > 0

P + T -

  1. All possible backbone sequences for I1 and its relation to the circuit's function.