proto-oncogene
C2CEFR level
88/100Rarity: very rare
TechnicalRegister
A normal cellular gene that can promote cancer when mutated or overexpressed.
A mutation had converted the proto-oncogene into an active oncogene driving the tumour.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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