In 2012, the ENCODE project, a research program supported by the National Human Genome Research Institute, reported that 76% of the human genome's noncoding DNA sequences were transcribed and that nearly half of the genome was in some way accessible to genetic regulatory proteins such as transcription factors.
En 2012, o proxecto ENCODE, un programa de investigación do Instituto Nacional de Investigación do Xenoma Humano (National Human Genome Research Institute), informou que o 76% das secuencias de ADN non codificantes do xenoma humano eran transcritas e que case a metade do xenoma era dalgún modo accesible ás proteínas xenéticas reguladoras como os factores de transcrición.