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Fig. 21: Extrusomes - paracrystalline packing of mucocyst subunits

Mucocysts have a herringbone pattern of subunits and are surrounded by a membrane that fuses with the plasma membrane. When the mucocyst content is extruded the content expands (see Hausmann, Protistologica 8:401-412, 1972 for details). tr mt, transverse microtubules; er, rough endoplasmic reticulum. EM taken on 8/12/67 by R. Allen with Philips 200 TEM. Neg. 19,200X. Bar = 0.2µm.
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