新生 しんせい突然 とつぜん変異 へんいじゃなかったです
shinseitotsuzenhen'ijanakattadesu

Noun
Desu Copula

The polite, past negative form of 新生突然変異

1. Was not a new mutation.; Wasn't a sudden mutation.

Past/Perfective
Negative
Polite
Casual Register
Genetics