Fig. 4From: Structural identifiability of cyclic graphical models of biological networks with latent variablesThe reduction process of the identifiability matrices from Fig. 1a. In the left column, we subtract matrix σ 12 from matrix σ 14; in the middle column, we then subtract matrix σ 34 from matrices σ 13 and σ 23; and finally, we get the reduction result in the right columnBack to article page