The RNA/mRNA strand can be described as

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.

answer; endoplasmic reticulum;