Spatio-temporal mapping of gene regulation. Lagrangian representation of Actin11 (A), EF1β (B) transcript accumulation rate (a.u. mm-1 min-1) and total RNA accumulation rate (C) (ng mm-1 min-1) along the primary root apex and with time. Net accumulations rates (Z axis) are plotted along the growth trajectory of an element (curve in the XY, see Figure 1C). Computed on Matlab software.