Microscopic biological computers that could one day operate as a doctor on a cellular level have been unveiled.

Made of biological molecules, the computers are so small a trillion can fit in a drop of water.

Scientists at the Weizmann Institute of Science in Israel successfully programmed the micro-computer to identify, in a test tube, changes in molecules indicating the presence of prostate cancer.

After correct diagnosis, the computer released short DNA strands designed to kill the cancer cells, science journal, Nature reports.

DNA makes up the software of the micro computers with the hardware composed of DNA-manipulating enzymes.

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