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protofilament
protofilament n.
Brit. 
/ˌprəʊtə(ʊ)ˈfɪləm(ə)nt/
, /ˌprəʊtə(ʊ)ˈfɪləm(ə)nt/U.S. /ˌproʊdoʊˈfɪləm(ə)nt/
Cell Biology a strand of fibrous protein; spec. a subunit of a microtubule./ˌproʊdoʊˈfɪləm(ə)nt/ΘΚΠ
the world > life > biology > substance > cell > cell substance > [noun] > protoplasm or cytoplasm > structure or substance in cytoplasm
microsome1881
myoneme1893
tonofibril1901
Holmgren1921
tonofibrilla1925
cytoskeleton1936
protofibril1948
protofilament1960
microfilament1963
tonofilament1964
cytosol1965
1960 Amer. Jrnl. Cardiol. 5 387 (caption) Arrow indicates a place where the M line presents only a thickening and darkening of the individual protofilaments.
1977 Jrnl. Protozool. 24 4/1 Microtubules..can be thought of as protofilaments that are end-to-end polymers of dimers which are then bound together to form a tube with an open lumen.
2005 Biophysical Jrnl. 89 2911 An important aspect of microtubule assembly is that hydrolysis of the beta-tubulin-associated GTP promotes protofilament curling.
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