I bought a vial of White Labs WLP007 liquid english ale yeast, along with some hops from the LHBS. Not thinking, I stuck the whole bag in the freezer, since I wasn't going to be brewing for about a week and wanted to keep the hops fresh. Well, when my brew day came, I discovered the frozen yeast. Are my yeast dead, or is it still usable? I took it out of the freezer and stuck it in the fridge, its been there since.