Which poisonous bacterial protein is best for you?

As someone who has never had botulinim toxin injected in my face as a way to prevent wrinkles, it never occurred to me that different strains of the toxin might have different levels of effectiveness. Yet enterprising researchers from San Francisco have studied these poisons extensively, pitting two types against… » 6/23/11 10:14am 6/23/11 10:14am