Biological systems

A sequence of superimposed pictures indicates the Z-shaped geometry of the spiral core
Single cells of an amoeba population flow together in a vortex-shaped movement
Stationalry distribution of alkaline and acid regions around an illuminated Chara cell
Spiral shaped propagation of Spreading Depression in neuronal tissue
Spiral geometry of a signal transmitter in an amoeba population (Dictyostelium dicoideum)