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Regulation motifs. (A) - The simple regulation motifs: (s1-s2) coherent simple regulation, (s3-s4) incoherent simple regulation. (B) - The feedback loop motifs: double-positive (left), double-negative (middle), and negative (right). (C) - The feedforward loop motifs: (c1) coherent type-1 feedforward loop, (i1) incoherent type-1 feedforward loop. (D) - The autoregulation motifs: (par) positive autoregulation, (nar) negative autoregulation.
