The very concept of an Iranian university is an oxymoron. There are no free and open places of learning in that repressive theocracy. Dissenters are not given tenure; they are murdered, after first being tortured. Blasphemy, which is broadly defined, is punished. Gays are not only excluded from Iranian universities, but are imprisoned and killed.
I've read that it's the smell some carnivores use to find their prey. Imagine the trembling victim trying to hide, but knowing that the smell of its own fear will kill it.