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Example observations of S. roeseli's different behavioural responses upon stimulation with polystyrene beads. (a) At rest: S. roeseli is fully extended with cilia beating to generate a vortex current. (b). Bending. (c) Transient halting of cilia beating (arrow). (d,e) Full contraction after encountering the fluorescent beads. (f) The organism slowly extended after contraction until full length is reached. (g,i) Tube abandonment and leaving. (Online version in colour.)
