http://en.wikipedia.org/wiki/Infusoria
In infusoria and some flagellates, the differentiated threads of ectosarc, which are contractile and doubly refractive, perform the function of muscle fibres in the Metazoa.
In infusoria and some flagellates, the differentiated threads of ectosarc, which are contractile and doubly refractive, perform the function of muscle fibres in the Metazoa.
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