Fish Mutation Adapts To Pollution

[gruber]

http://news.discovery.com/animals/fi...on-110217.html

The culprit is a gene for a type of molecule in fish cells (called a receptor) that, in tomcod without the mutation, binds to the toxic molecules, ultimately triggering a cascade of cellular reactions that cause big problems.
But the mutated gene in the Hudson tomcod reduces the binding of pollutant molecules to the receptor by fivefold, which lessens the toxic effects on the fish.

awesome well not the toxin part being there in the first place.