March 2014—Not many components of human cell biology have been discovered and immediately dubbed “junk.” But micro-RNAs, small noncoding RNA molecules first identified in 1993, fall into that category. Like Hans Christian Andersen’s Ugly Duckling, microRNAs began their life after discovery with people scoffing at them. People even laughed at researchers who thought microRNAs held promise in diagnosing cancer.
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