Scale animation problem

Hi,

I'm trying to achieve a "breathing" effect, I mean: there is a GO with a mesh and this GO's scale should do something like: 1 -> 1.1 -> 1.2 -> 1.3 -> 1.2 -> 1.1 -> 1 -> 1.1 -> ...

I've made an Animation, and if I play it, the GO's scales correctly, but when I launch the game, its scale (visually) is 1, although GO.transform.localScale is changing (how it should).

I don't know if I've explained myself, sorry for my English, I can explain again if you need.

Thank you.