How do NK cells [large granular lymphocytes] survive its own components?

I’ve just read that NK cells have perforins and granzymes that create holes and then activate suicide of other cells. How do they ‘store’ those proteins to keep them from destroying themselves? Whatever mechanism(s) they use, does that mean NK cells are invincible - in other words, they just can’t die even if other cells want to kill them?

Am I the only one who thought this post was about North Korean communist cells?

Nope.

For those wondering what this has to do with North Korea, here is the wikipedia article on Natural Killer cells (aka NK cells):

Moderator Note - thread title also edited for clarity

Thank you. Re-reading that post, I do realize the confusing thing myself :stuck_out_tongue: