In the most recent film version of " I am legend " ( a 1954 story by richard matheson ) , the zombie-like mutants are the result of an attempt to cure cancer .
The effort included screening 2 million randomly created mutants and infecting ferrets to let strains further adapt to them .
这种努力，包括从随机创建的200万个突变中筛选，并感染雪貂，让这些毒株进一步地适应雪貂。
By the time you emerge from a fallout shelter to search for your missing father , the surface world has devolved into warring factions of mutants , survivors and soldiers .
