In the following schematic drawings showing four different network motifs in gene transcription circuits, indicate whether each of the motifs 1 to 4 corresponds to a feed-forward loop (E), flip-flop device (F), negative feedback loop (N), or positive feedback loop (P). Your answer would be a four-letter string composed of letters E, F, N, or P only, e.g. PNEF.

Question

In the following schematic drawings showing four different network motifs in gene transcription circuits, indicate whether each of the motifs 1 to 4 corresponds to a feed-forward loop (E), flip-flop device (F), negative feedback loop (N), or positive feedback loop (P). Your answer would be a four-letter string composed of letters E, F, N, or P only, e.g. PNEF.
In the following schematic drawings showing four different network motifs in gene transcription circuits, indicate whether each of the motifs 1 to 4 corresponds to a feed-forward loop (E), flip-flop device (F), negative feedback loop (N), or positive feedback loop (P). Your answer would be a four-letter string composed of letters E, F, N, or P only, e.g. PNEF.