Deinococcus radiodurans
Deinococcus radiodurans has the systems for DNA repair, DNA damage export and genetic redundancy. It can recover from desiccation (loss of water) and starvation. It has a very high tolerance to radiation forms like gamma radiation.  It is so far known as the most radioactive resistant organism. Thioredoxin reductase is an enzyme found in the cells' response to double-strand DNA breaks.