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Fig. 4 Quantitative comparison of Lagrangian Kinematic Profiles (LKPs) in a cohort of zebrafish embryos (A and B) Comparison of the LKPs’ mean (line) and variance (shaded area), calculated for selected cell populations (selection at the tail bud stage, Figure S8, Video S22), hypoblast (red) and epiblast (blue) in embryos wt1-wt5 (rows 1 through 5, respectively). (A) Instantaneous LKPs. Time in hpf. The vertical dashed black line indicates the onset of epiblast compression chosen as the initial time ( ). (B) LKPs cumulated from ( ) for the next 6 h, mean (line) and variance (shaded area). The five plots are aligned in time using as reference. Hypoblast was not analyzed in embryo wt2 as it was not detected at because of that embryo’s position in the field of view.