Here, I mean more the reaction to it, I sometimes cringe at the pronunciation or intonation in the way one would to nails on a chalkboard (the idiom can have more than one meaning or reaction attached to it)
It looks quite grotesque when mounted on the mice mind you. The "flourescent molecules" are by far the coolest, just google GFP (green flourescent proteins) and optogenetics - basically force specific behaviours or genetic expression in a mouse by shining light in the area you injected the optogenetic anitbodies.
Here, I mean more the reaction to it, I sometimes cringe at the pronunciation or intonation in the way one would to nails on a chalkboard (the idiom can have more than one meaning or reaction attached to it)