Movie S8.
A junction leaves a stationary mLnp1 punctum and moves toward another junction to complete a ring closure. The arrowhead points to a junction without mLnp1. The solid circle marks a stationary junction with mLnp1.
A junction leaves a stationary mLnp1 punctum and moves toward another junction to complete a ring closure. The arrowhead points to a junction without mLnp1. The solid circle marks a stationary junction with mLnp1.