ZFIN Image: Dokmegang et al., 2021, Fig. 4.

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Figure Caption

Fig. 4.

Analysis of directional cell behaviors in the zebrafish pectoral fin. (a) Schematics in 2D of the method used to analyze directional cell behaviors: for each cell i, θ_i denotes the polarity angle that this cell forms between its elongation axis 𝑒→Max𝑖 ${\vec{e}}_{i}^{Max}$ (extracted from the maximum eigenvalue of the covariance matrix of its neighborhood 𝒩𝑖 $N_{i}$ ) and the PD axis 𝑢→ $\vec{u}$ . (b–d) Lateral view of the pectoral fin at different stages of development, respectively 𝑡=28.0 $t = 28.0$ hpf, 𝑡=37.9 $t = 37.9$ hpf and 𝑡=47.7 $t = 47.7$ hpf. (e–g) Vector field of the cells’ elongation axes 𝑒→Max𝑖 ${\vec{e}}_{i}^{Max}$ in the pectoral fin at the same stages. (h–j) Distribution of the polarity angles θ_i of the cells in the pectoral fin at the same stages, compared with the standard distribution of random angles formed by two arbitrary vectors in 3D (red curve). (k) Evolution over time of the average polarity angle 𝜃⎯⎯ $\bar{θ}$ of the fin cells ± its standard deviation Δθ $Δ θ$ shown in red

Acknowledgments

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