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protofibril
protofibril n. 
/ˌprəʊtə(ʊ)ˈfɪbrɪl/, /ˌproʊdoʊˈfaɪbrəl/ Cell Biology a strand of fibrous protein that is a subunit of a filament, microfibril, etc.
Brit. /ˌprəʊtə(ʊ)ˈfʌɪbrɪl/
, /ˌprəʊtə(ʊ)ˈfʌɪbrɪl//ˌprəʊtə(ʊ)ˈfɪbrɪl/U.S. /ˌproʊdoʊˈfɪbrəl/
, /ˌproʊdoʊˈfɪbrəl//ˌproʊdoʊˈfaɪbrəl/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
1948 Analyt. Chem. 20 90/2 The fibrous part of the cortex is composed of protofibrils.
1967 Jrnl. Cell Biol. 33 700/1 The term ‘filament’..is more often used for the fibrous structure which has a dimension between that of a ‘fibril’ and that of a ‘micro- or proto-fibril’.
2003 Jrnl. Molecular Biol. 333 1003 The presence of the protofibrils and the enhanced aggregation at slightly acidic pH is consistent with the behavior of other amyloid-forming proteins.
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