Sentence examples for it isn't a case of either from inspiring English sources

Because if it isn't the developmental system that does it, if it isn't a case of either an environmental perturbation or mutation simply kicking the developmental system into another pathway which already exists, how could you possibly explain the fact that the two -- that is to say a bit of chilling or a mutation -- have precisely the same effect on the organism?

It is not a case of attitude.

It is not a case of either/or.

It is not a case of picking a famous university.

"It wasn't a case of ruthlessness.

"It's not a case of trickery; it's a case of stupidity," Mr. Chidester said.

It's not a case of if.

"It's not a case of can't.

This isn't a case of "alarmism".

This isn't a case of Elmophobia.

This is not a case of riot.