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Fig. 4: contractile vacuole pores and CV in systole

A CV in systole. The CV has collapsed into vesicles and tubules (brackets). Three CV pores (arrows) can be seen where the CV meets the pellicle. Smooth membrane cisterna surrounds some cytoplasm, possibly a developing stage of an autophagic vacuole (av). per, peroxisome; pp, pellicular pore. EM taken on 6/12/69 by R. Allen with Philips 300 TEM. Neg. 9,250X. Bar = lµm.
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