mutation

What's more, in recent years rats have developed genetic mutations that give them some immunity to these powerful drugs too.

This mutation turns a normal protein needed in the brain – called the huntingtin protein – into a killer of neurons.

"These are lobsters with a genetic mutation that causes an overproduction of crustacyanin, giving them a vivid, electric blue appearance."

These acquired mutations produce new variants, which is why both the COVID-19 mRNA and the whole-virus flu vaccine get updated annually – to keep up with natural changes in the virus.

The condition is caused by a mutation in the genes.