title: Movement by non-actin filament mechanisms.
abstract: Non-actin contractile MFS exist in Protozoa. Their chemical constitution is partially known. They are ATP-independent, but their various physiological characters can be ultrastructurally grouped into two types: either, as it is the case for actin, they are closely associated to the endoplasmic reticulum apparatus, or they form myonemal bundles which are not related to any other organelle.
mesh_terms: D000199:Actins / Q000502:physiology; D000818:Animals; D002465:Cell Movement; D003285:Contractile Proteins / Q000502:physiology*; D003599:Cytoskeleton / Q000502:physiology* / Q000648:ultrastructure; D056890:Eukaryota / Q000502:physiology*; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure; D013045:Species Specificity
chemical_list: D000199:Actins; D003285:Contractile Proteins